88 Society for Experimental Biology and Medicine. 



(3 x io -7 ) and of the ion H 2 P0 4 (2 x io~ 7 ). Although the equi- 

 librium in such a system at 40 0 C. may be somewhat different it 

 is evident that this equilibrium is calculated almost perfectly to 

 protect protoplasm from variation in neutrality. The variation 

 in hydrogen and hydroxyl ionization can hardly be more than 

 5 x io -7 . 



The theory of the transport of carbonic acid is now being in- 

 vestigated in the light of this great variation of combined carbonic 

 acid, and the variation which has been found in " acidosis." 



59 (202) 



The influence of adrenalin upon the venous blood flow. 

 By Russell burton-Opitz. 



[From the Physiological Laboratory of Columbia University, at the 

 College of Physicians and Surgeons.'] 



The blood flow in the femoral, external jugular and azygos 

 veins was measured by means of the stromuhr described by the 

 author. During the experiment, solutions of adrenalin were 

 injected centrally to the stromuhr. The effect of the adrenalin 

 showed itself in a retardation of the venous inflow which appeared 

 in from 14-16 seconds after the injection. Considering the velocity 

 of the venous blood stream, it must be assumed that the adrenalin 

 did not produce its characteristic effect until it had reached the 

 arterial side of the circulatory system. The experiments tend to 

 disprove the existence of vaso-motor nerves in the central veins 

 and the pulmonary circuit. 



60 (203) 



The viscosity of laked blood. 



By RUSSELL BURTON-OPITZ. 



[From the Physiological Laboratory of Columbia University, at the 

 College of Physicians and Surgeons.] 



It was found that the viscosity of laked blood prepared by the 

 process of freezing, is very much less than the viscosity of defibri- 

 nated blood. The specific gravity was only slightly lessened. 



