746 



CHEMISTR Y OF RESPIRA TION. 



life under water is much shortened when the temperature of the water is 

 high. The explanation of this is to be sought in the fact that the respi- 

 ratory exchange of these immature animals is relatively small, and rises 

 and falls with the external temperature. 1 



The practical importance of these experiments in connection with 

 the cases of suspended animation in children at birth, and in adults 

 after drowning, is obvious. 2 



THE EXCHANGE OF GASES BETWEEN THE BLOOD AND THE Am IN 

 THE LUNGS EXTERNAL EESPIKATION. 



The mechanism of the ventilation of the lungs is described in 

 another part of this work; 3 here it is necessary only to discuss the 

 frequency and volume of inspiration and expiration, the capacity of the 



1 This article, p. 713. See also "Animal Heat," this Text-book, vol. i. p. 865. 



2 "Report of the Royal Humane Society," 1865, p. 31. 



3 " Mechanism of Respiration," this Text-book, vol. ii. 



