Author: Defehrt, A. J. (1723-1774 (artist)
Title: Blanc de Baleine. [Spermaceti; Whale Oil] Engravings from Denis Diderot and Jean Baptiste le Rond D'Alembert: Encyclopédie, Ou Dictionnaire Raisonné Des Sciences, Des Arts Et Des Métiers
Description: Paris: Chez Briasson, David & Le Breton, 1762-1767. 395 x 255 mm. 1 plate with 1 page of letterpress descriptions. A white waxy substance produced by the sperm whale, formerly used in candles and ointments. It is present in a rounded organ in the head, where it focuses acoustic signals and aids in the control of buoyancy. .

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