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Hannover, Christian Ritscher, 1797-1803. Bound in 5 contemp. hcalf, gilt spines, tome-and titlelabels in leather with gilt lettering. On foot of titlepages 2 small stamps. Internally fine and clean, printed on good paper. The scarce first edition.

Paris, Crochard, 1821. Contemp. hcalf. Spine gilt with tome-and titlelabels with gilt lettering. Wear to top of spine. A crack along first hinge, but cover not loose. In 'Annales de Chimie et de Physique', Volume 19. (Entire volume offered). 448 pp. a. 2 plates. Navier's paper: pp. 244-260. A faint dampstain to margins of the first 20 leaves and a bit seen on the following pages, decreasing. First appearance of Navier's famous paper in which he describes the relations between fluid flow and friction, giving the FUNDAMENTAL EQUATIONS OF THE MATHEMATICAL THEORY OF ELASTICITY. The full paper was not published until 1828. Stokes's analysis of the internal friction of fluids was published in 1845, and as he was not familiar with the French litterature of mathematical physics, he derived independently his own equations, which accounts for the double-name of the equations. "The Navier-Stokes equation is now regarded as the universal basis of fluid mechanics, no matter how complex and unpredictable the behavior of its solutions may be. It is also known to be the only hydrodynamic equation that is compatible with the isotropy and linearity of the stress-strain relation." (Olivier Darrigol)."Navier studied the motion of solid and liquid bodies, deriving the partial differential equations to which he applied Fourier's methods to find particular solutions. This theoretical research led him to formulate the well-known equation identified with his name and that of Stokes. Navier viewed bodies as made up of particles which are close to each other and which act on each other by means of two opposing forces - one of attraction and one of repulsion - which, when in a state of equilibrium, cancel each otherout. The repelling force resulted from the caloric that a body possessed. When equilibrium is disturbed in a solid, a restoring force acts which is proportional to the change in distance between the particles."(DSB, X, p. 4)."The equations are useful because they describe the physics of many things of academic and economic interest. They may be used to model the weather, ocean currents, water flow in a pipe and air flow around a wing. The Navier-Stokes equations in their full and simplified forms help with the design of aircraft and cars, the study of blood flow, the design of power stations, the analysis of pollution, and many other things. Coupled with Maxwell's equations they can be used to model and study magnetohydrodynamics. "(Wikipedia).

Kjøbenhavn, Kongelige Wäysenhuses Bogtrykkerie, 1751. 8vo. In contemporary half calf with five raised bands. Light wear to extremities, leather on spine cracked. Head of spine with loss of leather. First leaves with marginal browning. Previous owner's name and annotations in contemporary hand to pasted down front end-paper. Inner front hinge split. Last quire detached, otherwise internally nice and clean. (10), 340, (1) pp. + 1 folded plate. The uncommon first edition of Kraft’s Logic which was made for the 1750 re-established Sorø Academy. Danish writer and academian Ludvig Holberg bequested most of his fortune to re-establishing the academy in 1750 after a devastating fire.Bibliotehca Danica I, 907.

Kiøbenhavn, L.H. Lillie, 1756. Samtidigt hldrbd. Let ophøjede bind på ryggen. Titeletiket med forgyldning. Øverste kapitæl nænsomt restaureret. Kobberstukket titelvignet visende et kildespring. (24),134,(1) pp., 1 udfoldelig tabel og 2 udfoldelige kobberstukne plancher, visende vanddyr. Trykt på svært skrivepapir. Lidt spredte svage brunpletter. Originaludgaven. Første egentlige undersøgelse af drikkevandsforsyningen til København, men også første danske beskrivelse af vandets småkrebs, daphnier og cyclops, som afbildes i bogen. - Lange trøster sine læsere med, at disse kan frasies med en pose af hvidt hattefilt, hvis De da ikke foretrækker at synke dem eller nyde suppen af dem når vandet er kogt.

Danzig, Kosten des Verfassers, 1852. 8vo. a. folio. 2 contemp. hcalf. Gilt spines. A paperlabel pasted on upper part of spines. Stamps on title-pages. (8),184,(2) pp. and 1 lithographed plate. Atlas with 22 (on 21) large lithographed plates, many double-page and folding. Some scattered brownspots. First edition. The original printing.

Kjøbenhavn, Em. Bærentzen & Co., 1869, 1870 & 1877. Folio. 3 bind indbundet i 2 samtidige halvlæder bind med 4 ophøjede bind og forgyldt titel på ryg. Men udvendinge brugsspor og lille hvidt mærke påklistret nederste del af ryggene. Indvendig sporadisk brunplettet. Bd 1: 82 pp. + 44 litograferede plancher (heraf flere i toner, samt 2 originale fotografier); Bd. 2. 88 pp. + 100 pp. + 40 litograferede plancher (heraf flere i toner). Bind 1 omfatter Kalundborg Kirke, Fjennesløvlille Kirke (herunder også landsbykirkerne i Meerløse og Uvelse), Aarhus Domkirke, Veng Klosterkirke, Sørup Kirke i Angel, Viborg Domkirke samt Sorø Kirke.Bind 2 er dedikeret alene til Roskilde Domkirke og bind 3 til Ribe Domkirke.

Altona, Gebrüdern Burmester, 1756. 8vo. Bound in beautiful full colour toned, marble like, full vellum with large decorative blindtooled rococcostamps on covers. On all over the spine a large tree with flowers and green leafs, on the ground birds, all made with stamps and blindtooled curved lines. All edges gilt and with some tooling. (10),XXII,(2),982;(4),750,(18) pp. A fine copy in a marvellous binding.

Berlin, Verlag Schall & Grund, 1896-1900. Bound in 5 orig. pictorial clothbindings, volume I with renewed spine, all spines with library labels. XV, 596; X, 527; XIII, 662; XVIII, 568; XX, 600 pp. With numerous folding maps and illustr. Library stamps.

Hafniæ, uden ang. af trykker, 1688. Lille 4to. Senere papbd. Ryg lettere defekt. (8)(af 16),174 pp. samt (4) pp. af Index (af Index mangler 10 blade, som dog foreligger i gammel håndskriftskopi. Her og der lidt brunplettet, og de første sider tæt beskåret. Hdle kataloget tilstede, men mangler 4 blade af forordet, ligesom der mangler 10 blade af de tre Index'er. Originaludgaven. Af største sjældenhed. Viridarium = "Danske Lysthaver" er det klassiske værk i dansk floristisk litteratur, den første danske flora, og i 100 år den eneste. - Heri opregnes 1103 arter, ordnet efter de latinske navne og tilføjede danske og tyske, samt blomsternes lokalitet. Bibl. Danica II:189.

Paris, Chez Fuchs, An IX(1801). Boundin 3 contemp. hcalf. Gilt spuines. Light wear along edges. In: "Annales de Chimie, ou Recueil de Mémoires concernant la Chemie" Tome 36, 37 and 38. (Entire volumes offered). 336;330,(2);334,(2) pp. and 5 engraved plates. Berthollet's paper: pp. 302-317, pp. 151-181, 221-252, pp. 3-29, 113-134. Together with the memoir printed at the same time in "Mémoires de l'Institut.." this is the first appearance of B's groundbreaking work on the nature of chemical affinity and the fact that many factors influence chemical reactions, comparing chemical affinity to the force of gravity. The paper was at the end of the year published separately.The theory set forth here "led directly to Prout's investigations which yielded a knowledge of definite chemical proportions and thus played a very importent part in preparing the way for the development of the Atomic Theory on which the whole modern chemistry is based."(Duveen, p. 75)."Berthollet read a memoir on the general theory of affinities while he was still in Egypt. This was the starting point of his complete new system of chemistry, first briefly sketched in Recherches sur les lois de l’affinité (1801) and later developed into the comprehensive, two volume Essai de statique chimique. Here he attempted to provide a proper basis for chemistry, so that its experimental results could be viewed in the light of theoretical first principles. Berthollet developed a theory and a model adequate for the understanding and the interpretation of the rapidly growing body of chemical knowledge in his time. He was aware that the positive work of constructing a new theory had yet to be performed after the shock of Lavoisier’s criticism of the old chemistry.(DSB).Parkinson "Breakthroughs", 1801 C.

(No place), The Association for Symbolic Logic, 1959. Lev8vo. Bound in red half cloth with gilt lettering to spine. In "Journal of Symbolic Logic", Volume 24. Barcode label pasted on to back board. Small library stamp to lower part of 6 pages. A very fine copy. Pp. (1) - 14. [Entire volume: VI, 374 pp.). The seminal first printing of Kripke's debut article, which provided the basis for his logic and for the model theory for modal logic in general. The work constitutes the very beginning of Kripke Semantics (often called possible world semantics). Kripke's works in general are rare in fist editions. Many of them remain unpublished and are only known in privately circulated manuscripts.The American philosopher Saul A. Kripke (born 1940) is an exceedingly important logician and philosopher of language and one of the most powerful and influential thinkers of analytic and Anglo-American philosophy. He is considered the greatest living philosopher and perhaps the greatest since Wittgenstein. In 2001 he was awarded the Schock Prize in Logic and Philosophy, which is considered the philosopical equivalent of the Nobel Prize.Kripke, who grew up in Omaha in a religious Jewish family, was somewhat of a prodigy child. During grammar school he got intimately acquainted with and mastered to perfection algebra, geometry and calculus, and very early on he took up philosophy, which later became his career. Still a teenager, in high school, he wrote a work that was to change the face of philosophical logic forever, namely the groundbreaking paper "A Completeness Theorem for Modal Logic", which was printed a few years later, in 1959, in the Journal of Symbolic Logic, while he was in his first year at Harvard University. This seminal debut work proposed what later came to be known as Kripke models for modal logic. The story goes that the paper earned a letter from the department of mathematics urging Kripke to apply for a job there, to which he is said to have written an answer explaining "My mother said that I should finish high school and go to college first."In 1962 he graduated from Harvard University, where he remained until 1968, first as a member of the Harvard Society of Fellows and then as a lecturer. During these years he developed the logical theories founded in the "Completeness Theorem" further and made seminal contributions to the field of logic and semantics. Kripke Semantics is a formal semantics for non-classical logic systems that Kripke began developing in his teenage years, first published something on in 1959 (the present work) and further developed in the 60'ies and. The development of Kripke Semantics was no less than a breakthrough in the making of non-classical logics, of which no model theory existed before Kripke's. With this work, Kripke laid the foundation for proving completeness theorems for modal logic, and for identifying the weakest normal modal logic, which is now named K after him.

London, Harrison and Sons, 1905. Bound in recent marbled boards. Both papers extracted from "Proceedings of the Royal Society of London", vol. 74, With title-page to volume 74. Pp. 476-487 and pp. 488-498. First printing of these two seminal articles, in which the basic principle of the modern wireless valve, also called the "Fleming Valve", is introduced for the first time, making radio-telephony and broadcasting possible. "The immense superiority of the Fleming thermionic valve to all previous detectors of wireless waves caused it to be widely used as an efficient and reliable detector." (PMM). When Lee DeForest perfected the "grid" in 1907, Fleming's wireless signals could be amplified to the degree necessary to make radio-telephony and broadcasting possible. The Edison effect was first described in a paper by William Henry Preece, who was shown an experiment by Edison "On a peculier of Glow-Lamps when raised to high Incasdence", 1885. This effect was known as the "Edison effect", and in 1890 Fleming, an electrical engineer who had worked with Edison Company in London and was now professor at University College, began a careful study of this phenomenon in carbon filament lamps. In 1904 he was able to demonstrate that this occurred not only with electric waves but also with wireless waves. He thus introduced the basic principle of the modern wireless valve, which permits only unilateral conductivity. (see PMM No. 396).Shiers, Early Television. A Bibliographical Guide to 1940, no. 323 (for the first article here present); the article has been reprinted in George Shiers, ed. !The Telephone: An Historical Anthology", 1977. PMM no. 396 (for the first article here present).

Kjøbenhavn, C. A. Reitzel, 1840. Indbundet i et samtidigt halvlæderbind med rig rygforgyldning. Forgyldt rygtitel. False en smule slidte. Tidligere ejers navnetræk på titelbladet. Nederste højre hjørne af titelbladet restaureret. Originaludgaven. BFN 360.

Worcester MA, The Heffernan Press, 1976. Royal8vo. In the original blue printed wrappers. In "The Bell Journal of Economics": Vol. 7, No. 1, Spring 1976. Entire volume offered. Very light wear to extremities otherwise a very fine and crisp copy (not ex-library). Pp. 73-104. [Entire volume: 353 pp.]. First printing of Williamson's seminal paper - one of the most influential in economics of regulation - in which he argued that in the presence of uncertainty about future demand or costconditions, the transactions costs of writing a complete contract, contingent on all future outcomes is prohibitively costly. The paper initiated together with Goldberg's paper published the same year the new field of "transactions-cost economics".The paper was a contributing factor in Williamson being awarded the Nobel prize in Economics in 2009 for his " work in economic governance."In the paper he states that: "A once-for-all auction for the provision of a natural monopoly service is, in practice, totally impractical. On the other hand, periodic re-tendering introduces its own problems. Most public utility industries require substantial sunk, long-lived investment - whether in distribution wires, rail lines, or telecommunications conduits. Where the life of this investment exceeds the life of the franchise, contractual arrangements must ensure continued investment and maintenance of the sunk asset. It may be difficult to verify the quality of the maintenance of the asset ex post. This is particularly the case where the quality dimension includes maintaining the human capital of the staff required to ensure the continued operation of the asset. In addition, the incumbent provider of the service is likely to have better quality information about the likely cost and demand characteristicsof the service, providing an informational advantage over potential rival bidders.To illustrate these ideas, Williamson used a case study based on the experience of tendering cable television franchises in Oakland, California. He concludes: That franchise bidding for cable television has superior properties to regulation is not transparent - Not only is simple franchise bidding - beset with numerous transactional difficulties, but the institutional infrastructure that predictably develops to check dysfunctional or monopoloid outcomes has many of the earmarks of regulation. Using modern language, Williamson highlights and emphasises the importance of transactions costs. Williamson introduced for the first time the notion that natural monopoly regulation can be viewed as a form of long-term contracting. That long-term contract incorporates mechanisms to allow for adjustment to changes in the environment: At the risk of over-simplification, regulation may be described contractually as a highlyincomplete form of long-term contracting in which (1) the regulatee is assured an overall fair rate of return, in exchange for which (2) adaptations to changing circumstances are successively introduced without the costly haggling that attends such changes when parties to the contract enjoy greater autonomy'."

Wisconsin, The Association for Symbolic Logic, 1938-39. Lev8vo. Bound in red half cloth with gilt lettering to spine. In "Journal of Symbolic Logic", Volume 3 & 4 bound together. Barcode label pasted on to back board. Small library stamp to lower part of 6 pages. A very fine copy. [Kleene:] Pp. 150-55. [Entire volume: 4, 212, (4), 194, (2) pp.]. First printing Kleene's milestone paper in which Kleene's O (Ordial numbers), a recursive function, is introduced. In set theory and computability theory, Kleene's is a canonical subset of the natural numbers when regarded as ordinal notations."In the seventeenth century, Leibniz envisaged a universal language that would allow one to reduce mathematical proofs to simple computations. Then, during the nineteenth century, llgicians such as Charles Babbage, Boole, Frege and Peano tried to formalize mathematical reasoning by an "algebraization" of logic. Finally, [...] Gödel, Church and Stephen Kleene introduced the notion of recursive functions. (The Princeston Companion to Mathematics. P. 111).The volume also contains the following papers of interest:1. Quine, W. V. Completeness of the propositional calculus. Pp. 37-402. Quine, W. V. On the theory of types. Pp. 125-39.3. Church, Alonzo. Additions and corrections to A bibliography of symbolic logic. Pp. 178-92.

Wien, Braumüller, 1849. 8vo. Bound with the original printed wrappers in a recent card-board binding. Ex-libris pasted on to verso of front board. Wrappers browned and internally with occassional marginal brownspotting. 52 pp. The very rare first edition, posthumously published, of a series of three lectures given by Bernard Bolzano in 1816 at the University of Prague. Here Bolzano steps into the sociopolitical arena addressing the relationship between the Czech and German populations in Bohemia (then part of the Habsburg Empire). Remarkably progressive, Bolzano’s call for tolerance and his opposition to nationalist exclusivism was ahead of his time especially considering the later ethnic tensions in the region.

Paris, Florentin Lambert et Jean Cusson, 1683. 4to. Contemp. full calf. Raised bands. Gilt spine. Wear to spine ends. A crack in leather along upper joint. Corners bumped. First edition.

London, Thomas Parkhurst, 1674. 8vo. In contemporary full calf with double ruled fillets to boards. Small paper-label pasted on to top of spine. Wear to extremities, leather cracked and boards with scratches. Inner hinges partly split but bookblock firmly attached. Internally with a few doodles in contemporary hand. (24), 388, (10), 31, (8) pp. Rare first edition of Whitaker’s eighteen sermons which had been taken in shorthand and published by his widow, with a dedication to Elizabeth, countess of Exeter. William Whitaker (1629–1672), a Puritan divine, entered Emmanuel College, Cambridge, at fifteen, where he distinguished himself in classical and oriental languages. He earned his B.A. in 1642. Two years later, he became a fellow of Queens' College by parliamentary ordinance and received his M.A. from the same institution in 1646. In 1652, he was ordained and became the minister of Hornchurch, Essex. He succeeded his father as rector of St. Mary Magdalen, Bermondsey, in 1654. Whitaker was one of the London ministers who petitioned the king against the Act of Uniformity's oppression.

Leipzig, Johan Ambrosius Barth, 1891-93. 2 orig. full decorated cloth. Very light wear to spine ends. XII,189;VIII,160 pp. and 4 plates (2 large folding) and textillustr. Clean and fine. On both front free endpaper the previous owners names, the two famous physicists Walter Makower and Aage Bohr 1945. First edition of one of Boltzmann's main works. "In the 1890’s Boltzmann again revived his interest in electromagnetic theory, perhaps as a result of Hertz’s experiments, which he repeated before a large audience in Graz. He published his Vorlesungen über Maxwells Theorie in 1891 and 1893, along with some papers in which he suggested new mechanical models to illustrate the field equations." (DSB).Walter Mackower, a research student under Thomson effected his transformation into a physicist, and his M.A. was for a thesis on the diffusion properties of radium emanation (radon). He later worked with Rutherford, Geiger, Rush and Fajans and he did pioneering research on radioactive substances and radioactive recoil.Aage Bohr, son of Niels Bohr, was awarded the Nobel Price in physics jointly with Mottelson and Rainwater in 1975 "for the discovery of the connection between collective motion and particle motion in atomic nuclei and the development of the theory of the structure of the atomic nucleus based on this connection".

(No place), The Association for Symbolic Logic, 1959. 8vo. Wrappers blank with printed title on spine. Entire issue No. 1 of vol. 24, offered. Fine and clean. The seminal first printing of Kripke's debut article, which provided the basis for his logic and for the model theory for modal logic in general. The work constitutes the very beginning of Kripke Semantics (often called possible world semantics). Kripke's works in general are rare in fist editions. Many of them remain unpublished and are only known in privately circulated manuscripts.The American philosopher Saul A. Kripke (born 1940) is an exceedingly important logician and philosopher of language and one of the most powerful and influential thinkers of analytic and Anglo-American philosophy. He is considered the greatest living philosopher and perhaps the greatest since Wittgenstein. In 2001 he was awarded the Schock Prize in Logic and Philosophy, which is considered the philosopical equivalent of the Nobel Prize.Kripke, who grew up in Omaha in a religious Jewish family, was somewhat of a prodigy child. During grammar school he got intimately acquainted with and mastered to perfection algebra, geometry and calculus, and very early on he took up philosophy, which later became his career. Still a teenager, in high school, he wrote a work that was to change the face of philosophical logic forever, namely the groundbreaking paper "A Completeness Theorem for Modal Logic", which was printed a few years later, in 1959, in the Journal of Symbolic Logic, while he was in his first year at Harvard University. This seminal debut work proposed what later came to be known as Kripke models for modal logic. The story goes that the paper earned a letter from the department of mathematics urging Kripke to apply for a job there, to which he is said to have written an answer explaining "My mother said that I should finish high school and go to college first."In 1962 he graduated from Harvard University, where he remained until 1968, first as a member of the Harvard Society of Fellows and then as a lecturer. During these years he developed the logical theories founded in the "Completeness Theorem" further and made seminal contributions to the field of logic and semantics. Kripke Semantics is a formal semantics for non-classical logic systems that Kripke began developing in his teenage years, first published something on in 1959 (the present work) and further developed in the 60'ies and. The development of Kripke Semantics was no less than a breakthrough in the making of non-classical logics, of which no model theory existed before Kripke's. With this work, Kripke laid the foundation for proving completeness theorems for modal logic, and for identifying the weakest normal modal logic, which is now named K after him.

La Haye, P. de Hondt, 1753. 4to. In contemporary half calf with five raised bands. Small paper-label pasted on to top of spine. Light wear to extremities. Ex-libris pasted on to pasted down front end-paper. Internally nice and clean. XII, 585, (3) pp. + 15 folded maps and plates (complete). Rare and finely illustrated 10th volume of Prevost’s extensive work on various travel accounts which cover numerous travel narratives to different parts of the world, documenting the discoveries, explorations, and adventures of travelers.This present 10th volume contain descriptions of Tartars, Tibet, Bukhara (Uzbekistan), China, India, Maldives, Batavia and Malakka with maps and plates to illustrate these areas. This present Hondt-edition is “Mainly a reprint of the Paris edition, but with many corrections and additions, especially in the later volumes. The maps and plates were finely engraved by J. van der Schley.” (Sabin 65404). According to Tchemerzine this the best edition.The first edition was published in Paris in seven volumes between 1744 and 1747. This present edition was published in 25 volumes between 1747 and 1780.Sabin 65404Tchemerzine IX, 233: ("C´estla meilleure édition de ce recueil")

Ultrajecti (Utrecht), Meinardi à Dreunen, 1658. 8vo. Contemporary full vellum. Spine wide as another work has been taken out of binding ?. (24),255,(1) pp. Internally clean. Scarce first edition of Leusden's Syrian Grammar.

Berlin, Verlage der Königl. Akadem. Kunst u. Buchhandlung, 1799. 8vo. In contemporary half calf. Traces from paper-label to upper part of spine. Wear to extremities, dampstain to spine. Last leaves with dampstain to lower margin, otherwise internally nice and clean. vi (i.e. iv), (5)-270 , (1) pp. Rare first edition of Grohmann’s work on the concept of revelation and mythology within the context of religion as defined by the principles of pure reason. It was originally attributed to Friedrich Schleiermacher, but Schleiermacher specifically denied authorship in a letter published in the Jenaische Literatur-Zeitung (June 16, 1806) Johann Christian August Grohmann was a German philosopher and and professor of Logic and Metaphysics, first in Wittenberg from 1803 and later in Hamburg from 1810, finally settling in Dresden. He is known for his contributions to the fields of logic and metaphysics.

(London, Taylor and Francis, 1866). Large 4to. Without wrappers. Extracted from "Philosophical Transactions of the Royal Society of London.", Vol. 156 - Part I. Pp. 249-268 a. 1 lithographed plate. A few brownspots to the plate. Having the titlepage to vol. 156 - Part I. A few brownspots to lower margins. First appearance of a major paper in the kinetic theory of gases, in which Maxwell proved that the viscosity was independent of pressure as predicted, and nearly a linear function of the absolute temperature T.One of Maxwell's major investigations was on the kinetic theory of gases. Originating with Daniel Bernoulli, this theory was advanced by the successive labours of John Herapath, John James Waterston, James Joule, and particularly Rudolf Clausius, to such an extent as to put its general accuracy beyond a doubt; but it received enormous development from Maxwell, who in this field appeared as an experimenter (on the laws of gaseous friction) as well as a mathematician."James Clerk Maxwell published a famous paper in 1866 (the paper offered) using the kinetic theory of gases to study gaseous viscosity. The internal friction (the viscosity) of the gas is determined by the probability a particle of layer A enters layer B with a corresponding transfer of momentum. Maxwell's calculations showed him that the viscosity coefficient is proportional to both the density, the mean free path and the mean velocity of the atoms. On the other hand, the mean free path is inversely proportional to the density. So an increase of pressure doesn't result in any change of the viscosity.

.London, Printed by Taylor and Francis - Published by the Author, (1862-) 73. Folio. Papersize 54,5x36,5 cm. Lithographed and fully handcoloured. Two birds, female and male in natural surroundings of flowering bush looking at a flying insect. J. Gould & H.C. Richter, del. et lith. - Walter, Imp. Fine and clean. The plate is accompanied with the original textleaf. (2) pp. This is an original plate from Goulds great work "The Birds of Great Britain", issued between 1862 and 1873. The plates in this work were executed by Gould himself, and a few by J. Wolf, H.C. Richer and Hart. Together with Audubon's plates, the Gould-plates are considered the best bird-art ever produced, AND THE PLATES IN HIS "BIRDS OF GREAT BRITAIN" ARE THE PEAK OF GOULD'S ARTISTIC LIFE. In the foreword Gould stresses the difference from his "Birds of Europe" in the treatment of the illustrations, the inclusion here of the figures of the baby birds and nests, and he comments "Many of the public are quite unaware how the colouring of these large plates is accomplished; and not a few believe that they are produced by some mechanical process or by chromo-lithography. This, however is not the case; every sky with its varied tints and every feather of each bird were coloured by hand; and when it is considered that nearly two hundred and eighty thousand illustrations in the present work have been so treated, it will most likely cause some astonishment to those who give the subject a thought.". Elsewhere he remarked upon employing "almost all colourists in London." - Wood p. 364. - Nissen No. 372. - Sitwell 102. - Zimmer pp. 261-62. - Not in Jean Anker.