210 



the circulation time increases rather in proportion with the surface 

 than the weight. That some of the blood takes a very long time to- 

 return to the heart is shown by the long time it takes to wash the 

 vascular system free of blood by the injection of salt solution. The 

 circulation -time is shortest for the heart and the retina. 



The circ\ilation-time for the stomach is relatively short equal 

 generally to about that of the lungs. It is relatively long in the 

 kidney, spleen, and liver, being much more variable in these organs 

 than it is in the lungs, more easily affected by changes of external 

 temperature diminished by warmth, increased by cold. 



CIRCULATION TIMES. 



Weight, 

 i 2-0 kilos 

 11-8 

 18-2 

 13-3 

 13-3 

 13-3 



Time 

 in Seconds. 



4-05 (pulmonary) 



8-70 

 10-40 



8-40 



10-95 (spleen) 

 13-30 (kidney v ; 



