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WÖHLER, FRIEDRICH & JUSTUS LIEBIG - CLASSIFYING ORGANIC COMPOUNDS.

Untersuchungen über das Radical der Benzoésäure. (+) Untersuchungen über das Radical der Benzoésäure. (Schluss). 2 Parts. (Researches on the Radical of Benzoic Acid).

Herman H. J. Lynge & Søn A/S
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Leipzig, Johann Ambrosius Barth, 1832. Without wrappers as issued in "Annalen der Physik und Chemie. Hrsg.von Poggendorff", Bd. 26, Stück 2-3. Pp. 193-352 a. pp. 353-496 a. 3 folded engraved plates. (2 whole issues offered having titlepage to vol. 26).). Wöhler & Liebig papers: pp. 325-343 (2. issue) a. pp. 465-485 (3. issue). Both issues clean and fine.

First appearance (but also in "Annalen der Chemie") of these outstanding researches on the benzoyl radical. where the importence of "radicals" to organic chemistry is illustrated."Along with his collegue, Friedrich Wöhler..who had already synthetized urea, Liebig wrote a famous paper (1832, the paper offered) in which he showed, for the first time, that a complex organic group pf atoms - a "radicale" as it is now called - is capable of forming a long series of compounds, behaving throughout as though it were an element. THE DISCOVERY IS OF PRIMARY IMPORTENCE FOR OUR CONCEPTION OF THE CHEMICAL CHANGES IN THE LIVING BODY."(Singer in "The Story of Living Things" p. 374)."In their classic paper - which was actually written by Wöhler although Liebig is listed as coauthor - they summarized their achievements: "...we make the general assertion that as a result of our experiments, it is established that there is a body, composed of three elements, that remains stable in the presence of reagents and that can be regarded not only as the radical of benzoic acid, bur perhaps with slight variatioons, as the radical of a large number of similar compounds.....Incidentally, many of the compounds they first prepared and described (such as benzoyl chloride) were importent in the future development of organic chemistry."(DSB XIV, pp. 476-477). - Parkinson "Breakthroughs", 1832 C
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Pfullingen, Günter Neske, (1954). 8vo. Original full black cloth with white lettering to spine. Very clean, bright, and fresh, also internally. Original orange dust-jacket with black lettering to spine and white lettering to front. Minimal edge wear. An excellent and clean dust-jacket with just minor signs of wear. Very slight soiling to title-page, otherwise no wear or markings to text. Letter from Heidegger inserted to inside of front board. Front free end-paper signed and dated by Heidegger and with an inserted note in ink from the person that Heidegger gave the book to stating that this highly personal memento from his student time in Freiburg and his memorable encounters with Heidegger was given to his son Matthias for his 40th birthday, in 1995. 283, (1) pp. First edition, presentation-copy signed by Heidgger and with an inserted letter, also signed and dated by Heidegger, of this seminal collection of lectures and essays, which was of decisive importance to the immense influence of Heidegger’s thinking upon post World War Europe. This collection of Heidegger’s lectures and essays contains such groundbreaking works as “Die Frage nach der Technik” (The Question Concerning Technology) and “Wissenschaft und Besinnung” (Science and Reflection), “”Dichterisch Wohnet der Mensch…” “, along with other important works written between 1936 and 1953 collected here for the first time. This collection would later be reprinted and serve as volume 7 of Heidegger’s collected works (the Gesamtausgabe). This copy is signed “Martin Heidegger” and dated (1954 – the year of publication) to the front free end-paper, and on the inside of the front board is inserted an autograph signed letter in Heidegger’s hand to “Sehr geehrter Herr Doktor” (honourable doctor), in which Heidegger asks to meet up the following day, suggesting different times of the day. The letter is dated Freiburg 10th of February, 1954, which is two days before Heidegger gave his groundbreaking lecture “The Question Concerning Technology” at the University of Freiburg, suggesting that the letter was given to someone attending the lecture, possibly someone with whom he wanted to discuss it beforehand. “The Question Concerning Technology” still serves as one of the most pertinent philosophical essays of modern time, foreshadowing what is arguably the greatest philosophical and moral dilemmas that we struggle with today due to modern technology. Heidegger begins with asking the question what technology is, in an attempt to fully understand its essence and to ultimately prepare a free relationship to it – a theme that could hardly be more relevant today. “As relevant now as ever before, this accessible collection is an essential landmark in the philosophy of science from one of the most profound thinkers of the twentieth century (New York Times). The advent of machine technology has given rise to some of the deepest problems of modern thought. Featuring the celebrated essay The Question Concerning Technology, this prescient volume contains Martin Heidegger's groundbreaking investigation into the pervasive enframing character of our understanding of ourselves and the world.” (Harper Collins: The Question Concerning Technology And Other Essays By Martin Heidegger, 2013). “Science and Reflection” (here published for the first time), a lecture delivered on August 4, 1953, to a small circle of attendees, is Heidegger’s meditation on the difference between science and “mindfulness”, and an as-relevant-as-ever attempt at uniting science as such, in itself, with its application and meaning, combatting scientific fragmentation. In line with the other foreshadowing lectures, “Dichterisch wohnet der Mensch”, given on October 6, 1951, in Bühlerhöhe, seeks to explore how to reach a peace or dwelling in a modern, technological world. Heidegger uses the quote by Hölderlin to explore how human existence is deeply intertwined with language and poetry and reaches the conclusion that to truly dwell is to live in a poetic way, allowing for the meaningful unfolding of the world through language. The other essays/lectures printed in this seminal volume are: Überwindung der Metaphysik (1936-1946) Wer ist Nietzsches Zarathustra (1953) Was heißt Denken? (1952) Bauen Wohnen Denken (1951) Das Ding (1950) Logos (Heraklit, Fragment 50) (1951) Moira (Parmenides, Fragment VIII, 34-41) (1952) Aletheia (Heraklit, Fragment 16) (1954)
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