94 RESPIRATORY EXCHANGE OF ANIMALS AND MAN 



to cool very gradually and experiments of short duration were made 

 from time to time during the process. The results of one of his ex- 

 periments, in which the temperature of 26 was reached before the 



6-9 



49 3-9 



/? 



!/*> 



JO-*) 



9*+ time 



Temp. 26 27 28 29 3O 3/ 32" 33" 3+ 35 36 37 38 



FIG. 27. 



animal died, are given graphically in fig. 27. The whole series of 

 determinations lasted from 9 in the morning to 7 in the afternoon. 



Krogh experimented on a young dog under curari (weight about 

 950 gr.) and obtained the following set of figures : 



Time. 

 12-09-12-16 



1-44-1-48 

 2-47-2-58 



4-00-4-06 

 4-22-4-28 

 4-57-5-02 

 5-08-5-I3 



Rectal Tp. O 2 per Minute c.c. 



of which some are shown in fig. 28 (H). 



Cold-blooded animals. Ege and Krogh [1914] have made experi- 

 ments on a gold-fish (Cyprinus auratus] immobilized by narcotization 

 with urethane. The influence of the temperature upon the oxygen con- 

 sumption was found to be the same as in the normal fish which was at 

 all temperatures exceptionally quiet, and a very regular curve was ob- 

 tained showing the quantitative relation between the temperature and 

 the metabolism (see fig. 30). 



Krogh [1914, 3] made a number of comparative experiments by 

 means of a small Regnault apparatus (described p. 26) on the in- 

 fluence of temperature upon the metabolism of 



