BOYLE, Robert (1627-1691). An Essay of the Great Effects of Even Languid and Unheeded Motion -An Experimental Discourse of some Unheeded causes of the Insalubrity and Salubrity of the Air, being a part of an intended Natural History of Air. London: M. Flesher, for Richard Davis, 1685.

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BOYLE, Robert (1627-1691). An Essay of the Great Effects of Even Languid and Unheeded Motion -An Experimental Discourse of some Unheeded causes of the Insalubrity and Salubrity of the Air, being a part of an intended Natural History of Air. London: M. Flesher, for Richard Davis, 1685.

Two parts in one volume, 8o (168 x 102 mm). Without blanks I7 and I8 in first part, and final blank of second part. Contemporary English sheep (rubbed). Provenance: bookplate with motto "touch not the cat bot a glove."

FIRST EDITION, with first state title-page (without Boyle's name). Boyle's anonymously published work on languid and unheeded motion "gives him a place in the history of thermodynamic concepts. Many passages indicate that Boyle was thinking of a 'mechanical equivalent of heat,' and that he considered heat to be the product of small particles in 'local motion'" (Norman). It also contains Boyle's re-evaluation of the ultimate particles of which air is composed. The second part on the salubrity and insalubrity of air contains Boyle's observations on the causes of the plague. Fulton Boyle 163; NLM/Krivatsy 1715; Wing B-3948; Norman 309.