Note 265 — BOOK II
Arthur John Brock translation
This is the “vital spirit” or pneuma which, according to Erasistratus and the Pneumatist school, was elaborated in the left ventricle, and thereafter carried by the arteries all over the body, there to subserve circulatory processes. It has some analogy with oxygen, but this is also the case with the “natural spirit” or pneuma, whose seat was the liver and which was distributed by the veins through the body; it presided over the more vegetative processes. cf. p. 152, note 1; Introduction, p. xxxiv.