24 Society for Experimental Biology and Medicine. 



The following data may serve as examples : 





Spec. Grav. 



No. of Red Corpuscles. 



Viscosity Coefficient. 





I.O248 





2397.7 





I.0382 



4,000,000 



I442.9 





I.0467 



4,700,000 



IOO9.3 



S -(- 30 c.c. corp 



I.0524 • 



5,700,000 



851.6 



Thus, the increase in the number of red corpuscles caused a 

 corresponding increase in the viscosity. It is also obvious that the 

 red corpuscles constitute the principal factor in determining the 

 viscosity of the blood. 



21 (164) 



A new recording stromuhr, with demonstration. 

 By RUSSELL BURTON-OPITZ. 



[From the Physiological Laboratory of Columbia U?iiversity, at the 

 College of Physicians and Surgeons."] 



The cylinder of this stromuhr is placed horizontally and car- 

 ries below its floor a valve, by means of which the inflowing blood 

 can be diverted alternately into the right and left half of the instru- 

 ment. The piston within the cylinder moves back and forth, there- 

 fore, in a horizontal direction and records its movements by means 

 of a pulley arrangement and a writing lever upon the smoked paper 

 of a kymograph. 



On account of its great sensitiveness, and the possibility of low 

 adjustment, this stromuhr is especially fitted for measuring the 

 blood flow in the veins. 



The instrument has been used by the author in testing possible 

 vaso-motor reactions in the pulmonary circuit. It was connected 

 with the vein draining the middle lobe of the left lung. The nerves 

 in the vicinity of the ganglion stellatum were stimulated. So far 

 the experiments have given negative results. 



