Symptoms of Decompression 



671 



the heart beats. The latter even follow this general rule much 

 more exactly than the former. 



Because of the clots which formed in the arteries and the ap- 

 paratuses, it has been almost impossible for me to measure in a 

 consistent manner the modifications of the cardiac pressure. The 



Fig. 50— Dog, Experiment CCXVIII. Fig. 51— Dog, Experiment CCXVII. 

 Simultaneous modifications of the number of respiratory move- 

 ments R and the pulse P under the influence of decompression. 



rare observations which I could make showed only slight diminu- 

 tions; it seemed to me that it would be necessary to go very far to 

 obtain noteworthy differences in animals which must be kept 

 motionless. At a pressure of 26 cm., the heart had retained the 

 same strength as at normal pressure (Exp. CCXIX). The results 

 would no doubt be different, if the animals were performing labor 

 comparable to that of travellers climbing a mountain. 



