Brain and the Conditions of Recovery after Compression. 23 



Fia. 11. 



1-0 



1-2 



14 



1-6 



1-6 



2-0 



2-2 



24 



2-6 



2-8 



3-0 



3-2 



3-4 



3-6 



3-8 



4-0 



4-2 



4-4 



46 



4-8 



5-0 



5-2 



5-4 



5-6 



5-8 



6-0 



6-2 



6-4 



6-6 



68 



7-0 



mifi. , 



I 2 



Time in 



4' 5' 6' 7 



minuses. 



e' 9' 10' 



12 13 14 



(c.) Venous Pressure Varied by Artificial Respiration. By this 

 means the surface may often be made to recover completely, or 

 nearly so. 



Conclusion. 



The foregoing experiments show clearly that the elastic recoil of 

 the living brain is due primarily to the elasticity of the braiu sub- 

 stance, and is not due to the pressure in the arterial system (general). 



The recoil, however, varies notably with changes in the pressure 

 in the venous system (cerebral). 



