This conclusion is borne out also for the salivary glands by the ingenious experiments of Verzar (9), but in the case of muscles Verzar found that their oxygen tension must be comparatively low and perhaps 0, since a diminution of the arterial supply (and pressure) of oxygen caused a distinct decrease in the oxygen absorption of the muscular tissue.

Working in this laboratory on the relation between the oxygen pressure in water and the oxygen consumption of a fish Gaar der (10) found that the consumption increased with the pressure even up to a whole atmosphere. The increase in consumption corresponded to the increase in physically absorbed oxygen, and Gaarcder concluded that the diffusion from the capillaries into the tissues is incapable of maintaining a positive oxygenpressure. This conclusion like Verz ar's is seemingly at variance with my countings of capillaries and calculations of the oxygen pressure head.