Author: HARTSOEKER, N.
Title: Description de deux niveaux d
Description: Amsterdam, No publisher [Desbordes?], 1711. 4to. W. small woodc. vign. on title, engr. head-piece, woodc. head-piece & 3 fine fold. engr. pls. at the end. Unbound. [A4]. (8 pp.). (Copy on very large paper, uncut.). (Blank righthand and lower margin up to 4.5 - 5.5 cm.). DMB 790 - 792: DSB VI, 148/9: Pogg. I, 1026/7: Partington II, 451/4: Mottelay 151/2: The famous Dutch scientist Hartsoeker, professor of mathematics and philosophy at Düsseldorf was a contemporary of Huygens, Malebranche and l'Hopital, and teacher of Czar Peter.: Hartsoeker published a number of addresses in the years 1706 - 1711 published as 'Conjectures Physiques' or 'Suite des Conjectures' or 'Eclaircissements sur les Conjectures Physiques' and 'Suite des Eclaircissements...'. This address dedicated to Johann Wilhelm Kurfürst von der Pfalz, to whom Hartsoeker was Court mathematician from 1704 - 1716, discussing instruments for measuring, weighing and levelling.: Comp. Daumas 56 and 143: Bierens de Haan, 1935: Hartsoeker is especially renowned as an instrument maker and because of his controversy with Leeuwenhoek over who was the first to see spermatozoa through a microscope. Hartsoeker claimed he did so 20 years prior to Leeuwenhoek. His 'Essay de dioptrique', 1694, now an extermely rare publication, informs us of Hartsoeker's decidedly spermist and preformationist views on embryology and generation, with the famous woodcut of a preformed human being in a sperm cell, as imagined by Hartsoeker on page 230 of the 'Essay' and on p. 226 of the Dutch translation 'Proeve der Deursicht-Kunde' by Ameldonck Block, 1699.

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