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København, 1896-97. 2 samt. hldrbd. med rygforgyldning. Rygge lidt slidte. Stempel på titelblade. (8),569,(5);570,(7) pp. Rigt illustreret.

Stockholm, Beijer, 1885. 4to. As extracted from "Acta Mathematica, 21. Band]. No backstrip. Fine and clean. Pp. 83-97. First printing of Poincaré's paper in which he developed the idea published by Fuchs in 1884. Fuchs established that the equation with fixed branch points can be made into a Riccati equation if its genus - the genus of the corresponding Riemann surface - with respect to u and du/dz is zero and can be integrated using elliptic functions if the genus is 1.

4to. Orig. full cloth. XI,636,244 pp. Richly illustr. with plates and textillustr.

(København), 1951. Large8vo. In contemporary half cloth with gilt stamp and lettering to front board. Offprint from "Geografisk Tidsskrift", vol. 51. Stamp to title-page. Fine and clean. Pp. 94-133. First appearance on Jacobsen's paper on the topographical, hydrographical and Meteorological challenges in navigating in the Arctic.

Digtet fra Otto Gelsted bærer titlen "Den første Sne" og blev trykt i "Enetaler" i 1922. Paul La Cours digt hedder "Nuet", og Carl Jørgensens lille fortælling, der nok snarere er et lille stykke prosa end poesi går under titlen "Dorthe."

London, W. Heinemann, 1913. 4to. Orig. pictorial full cloth. Top of spine with some tears. A scratch and a nick in middle of spine. Coloured frontispiece. VIII,191 pp., plates and folded map. First edition. Nissen ZBI:1184.

(Copenhagen), Fréres Philibert, 1758. Small 8vo. Contemp. hcalf. raised bands. Titlelabel with gilt lettering. (8),192 pp. Clean and fine on good paper. Indeholder 15 breve om danske forhold, regeringen, retsvæsenet, finansvæsenet, handelskompagnierne m.v. samt en oversættelse af Kongeloven.Roger var en Schweitsisk diplomat som blev J.H.E. Bernstorffs betroede privatsekretær.

Leipzig, Hirzel, 1911. 4to. Contemp. modest hcloth. Light wear to spine. Stamp on title. "Physikalische Zeitschrift. Hrsg. von E. Riecke und F. krüger. Zwölfter Jahrgang." XXIII,1256 pp Illustrated. Einstein paper pp. 509-10. The whole volume offered. First printing of Einstein's paper on the Paradox of Ehrenfest, first presented by Paul Ehrenfest in 1909.Weil No 44.

Paris, Boulland et Cie, 1825. 8vo. 2 volumes, uniformly bound in green paper covered boards with red leather title-label to spines with gilt lettering. A gilt 'D' and a corwn to both spine. Stamp of His Royal Highnes Prince August to both front free end-papers. Boards with wear, internally fine and clean. Second edition.

Paris, Dupont et Cie, 1826. Contemp. hcalf. Richly gilt spine. Gilt lettering. A paperlabel pasted on lower part of spine. Stamp. on title-page. (2),400 pp., 2 engraved portraits, 4 engraved maps (1 large folding). faint scattered brownspots.

Kiøbenhavn, Paa Forfatterens Forlag, 1821. Lille 8vo. Samtidigt marmoreret papirsomslag. 48 pp. samt 1 kobberstukket foldetavle med afbildninger af rotte-og musefælder. Rent frisk eksemplar på skrivepapir. Bibl. Danica II:173.

A Copenhague, Höecke, 1784. 4to. Uncut in blank wrappers. Unopened on fine paper. 32 pp. First edition. "In 1775 the Academy offered a prize of 4000 livres for a process for procuring an abundant supply of salpetre, the announcement being written by Lavoisier. Altogether 66 papers were received and the prize was finally awarded in 1782 to the brothers Thouvenel, who gave a full account of nitre plantation." (Partington III:p. 466).

(Paris, Gauthier-Villars), 1899. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences", Tome 128, No 3. Pp. (137-) 192. Entire issue offered). Crooke's paper: pp. 176-178. First appearance of Crooke's statement that radioactivity seems to violate the principle of the conservation of energy."Despite his speculative powers, Crookes at first took a conservative view of this new science, for he could not believe that radioactive elements decayed spontaneously, since this seemed to imply a violation of the conservation of energy. It was his view, expressed between 1898 and 1900, that the source of activity was external to the radioactive element. He imagined that radium, say, had the ability to act as a Maxwellian demon and select from the atmosphere those air particles which were moving more swiftly than the average, absorb some of their energy, and eject them at a lower speed. This theory, which never received full publication, contravened the second law of thermodynamics; and although Crookes thought that he might have experimental support for it, his evidence did not measure up to the critical scrutiny of Stokes." (DSB).The issue contains another notable paper HENRI BECQUEREL "Sur la dispersion anomale de la vapeur de sodium incandescante, et sur quelques conséquenceas de ce phénomene", pp. 145-151.This theory, which never received full publication, Page 480 | Top of Articlecontravened the second law of thermodynamics; and although Crookes thought that he might have experimental support for it, his evidence did not measure up to the critical scrutiny of Stokes.

(Paris, Gauthier-Villars et Cie, 1940). 4to. Without wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences", Tome 210, No 17. Pp. (589-) 616. (Entire issue offered). Stamp on front page. Weil's paper: pp. 592-594. First printing of Weil's importent paper in which he introduced the concept of Weil-pairing, giving a proof of the Riemann hypothesis for curves over finite fields.The Weil pairing is a pairing (bilinear form, though with multiplicative notation) on the points of order dividing n of an elliptic curve E, taking values in nth roots of unity. The Weil pairing is used in number theory and algebraic geometry, and has also been applied in elliptic curve cryptography and identity based encryption."The Weil pairing, first introduced by André Weil in 1940, plays an important role in the theoretical study of the arithmetic of elliptic curves and Abelian varieties. It has also recently become extremely useful in cryptologic constructions related to those objects."(Victor S. Miller).The Weil pairing is used in number theory and algebraic geometry, and has also been applied in elliptic curve cryptography and identity based encryption.

(London, Taylor and Francis, 1866). 4to. No wrappers as extracted from "Philosophical Transactions", Vol. 156 - Part I, pp. 309-359. Clean and fine. First printing. As Frankland discovered "Combining Power" (= valency), he had introduced powerfull analytical techniques."From 1863 to 1870 he and Baldwin Duppa exploited zinc etyl and other organic reagents, including ethyl acetate, in the synthesis of ethers, dicaarboxylic acids, unsaturated monocarboxylic acids and hydroxy acids. This meticulousw work revealed clearly the structure and relationship of these compounds, and of course its methodology had great bearing on the growth of the chemical industry."(DSB, V: p. 126).

London, Taylor and Francis, 1869. 4to. In plain white paper-wrappers with title-page of journal volume pasted on to front wrapper. In "Transactions of the Cambridge Philosophical Society", Volume 11. Fine and clean. Pp. 395-411, (1) + the pasted on title-page. First appearance.

Stendal, Franzen und Grosse, 1796. Contemp. boards, covers a bit later overcoated with marbled paper. Spine rubbed. XVI,612,(2) pp. The last leaves, especially "Register" with a faint dampstain to upper margins and upper corners, otherwise clean.

Kopenhagen, Leipzig und Darmstadt, 1827-30. 2 contemp. hcalf. Gilt spines. Titlelabels with gilt lettering. Stamp on title-pages. (8),188;(6),290 pp. A few scatered brownspots.

Mainz, Philipp von Zabern, (1977). Folio. Orig. full cloth. 69 pp. and 44 plates. (Archäologische Veröffentlichungen 20, Kairo).

Paris, Baillière, 1846. 8vo. In contemporary half calf with four raised bands and gilt lettering to spine. Two bookshop-labels pasted on to verso of front board, otherwise a nice copy. XVI, 371, (1) pp. + 1 folded plate (facsimilie of a letter). Rare first edition. Semelaigne I/290

Oldenburg (in Holstein), 1855-56. 2 cont. hcalf. Gilt spines. Paperlabels pasted on upper compartment of back. Stamps on titles. X,548,VIII,646,XLIII,IV pp.

Berlin, Deckerschen, 1849. Contemp. hcalf. Spine gilt. Top of spine worn. Stamp on titlepage. Facsimile-letter as frontispiece. XVII,375pp. Firs edition.

Kjøbenhavn, Hagerup, 1887. Lex8vo. Orig. bogtrykt papbd. Ryggen påsat shirt. (4),XXI,515 pp., 1 kort, 41 plancher. Indvendig ren.

Berlin, Mylius'sche Verlags-Buchhandlung (E.Schweigger), 1864. 8vo. In contemporary full cloth with blind-stamped boarders to bords. Previous owner's name in contemporary hand to front free end-paper. Light wear to extremities, otherwise a fine copy. VI, 147, (5) pp. + three plates. First appearance of Schweigger's important publication on ophthalmoscope: "This collection of Schweigger's lectures on the use of the ophthalmoscope is the first comprehensive work on the subject. The author is careful to provide anatomical interpretations for the ophthalmoscopic observations described. The work begins with optical considerations and auto-ophthalmoscopy; then follow the various ophthalmoscopic methods, the examination of the refractive media and the diagnosis of refractive errors, and the examination of the ocular fundus" (Albert et al., Source Book of Ophthalmology, no. 2099).

Berlin, Decker, 1774. Contemp. hvellum. Stamp on title-page. Titlelabel with gilt lettering. Engraved titlevignette. 144 pp., 1 folded engraved plate. Some browning throughout.