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Dell' Azione del Cuore ne' Vasi Sanguigni - SPALLANZANI, Lazzaro - 1768. 
1 p.l., 71,  pp. Small 4to, orig. semi-stiff boards, uncut. [Modena: 1768]. First edition and a lovely copy of one of the author's scarcer books. Spallanzani's Dell' azione del cuore ne' vasi sanguini, "outlined his findings on the action of the heart upon the blood vessels and was addressed to the great physiologist Albrecht von HallerÃ¢â¬Â¦ "Haller's microscopic observations of blood movements in his Deux mÃÂ©moires sur le mouvement du sang (1756) had been made by refracted light on medium-sized vessels in the isolated mesentery of the frog. Spallanzani, using P. Lyonet's novel dissecting apparatus, conducted his observations mostly in a darkened room with reflected light from sunbeams impinging upon exposed parts of the aquatic salamander. He systematically noted how the cardiac systolic force motivated the blood circulation. The rhythmic inequality of blood flow in the aorta and large vessels disappeared in medium and small arteries, becoming regular and uniform. The velocity diminished in the smaller vessels, but sinuosities did not retard the flow. In the smallest vessels, individual red corpuscles negotiated acute angles and folds by elastically changing shape. The blood velocity in the venous system increased as the caliber of the vessels enlarged. Haller responded to the many amplifications and corrections of his work by securing Spallanzani's election to the Royal Society of Sciences of GÃÂ¶ttingen."-D.S.B., XII, p. 556. Fine copy. ? Prandi, pp. 32-33.
[Bookseller: Jonathan A. Hill, Bookseller, Inc.]
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