Keill applied measurement and mathematics in his researches, claiming the "first calculations of the absolute velocity at which blood travels through the aorta and smaller vessels; he also recognized that the blood's velocity must decrease the number of arterial branches increases. Keill would also appear to have been one of the first to study the ratio of the bluid to the solid portions of the body, partly through experiments involving tissue desiccation" (DSB, 7, 274).

Digital facsimile from the Hathi Trust at this link.