EXCHANGE OF COLD-BLOODED ANIMALS. 

 TABLE continued. 



73 



Au examination of the above results shows that the respiratory 

 exchange of most of the cold-blooded animals is very small, but that a 

 marked exception exists in the case of insects, which have a metabolism 

 equal to that of the larger mammals. This remarkable exception finds 

 confirmation in the relatively high temperature 4 of insects and in their 

 wonderful muscular activity. 



1 " Cliem. Untersuch. u. d. Respir. d. Schlammpeitzgers," Breslau, 1855, S. 24. 



2 Compt. rend. Acad. d. sc., Paris, 1873, tome Ixxvi. p. 1141. 



3 Arch. f. d. ges. Physiol., Bonn, 1877, Bd. xiv. S. 78. 



4 Article "Animal Heat," this Text-book, vol. i. 



