22 



Mr. A. G. Levy. On the Elasticity of the Living 

 FIG. 10. 



On\ 234567 I 23456 789 10 II 12 13 14 15 



The" extent of recovery varies in different cases ; rarely it fails to 

 take place at all. 



It is important to notice that not only does the general surface 

 of the hemisphere rise, but that the saucer-shaped depression due to 

 compression is obliterated. 



To obtain a definite idea of the extent to which the pressure in the 

 cerebral veins rises .during asphyxia, I took the venous pressure 

 during asphyxia from the superior cerebral in two dogs. In one case 

 in^which the normal pressure was very low, about 1'5 of water, it 

 quickly rose to 8 cm., and in the other in which the normal was 

 6'5 cm. water, after the usual preliminary fall, it rose again to 7' 5 cm. 

 The asphyxial gasps when strong may cause a variation in pressure 

 amounting to 1 cm. water. 



