88 RESPIRATORY EXCHANGE OF ANIMALS AND MAN 



Cronheim [1911] has published the results obtained by Knauthe by 

 means of Zuntz's respiration apparatus for aquatic animals in curves ; 

 they show a rather irregular rise in the respiratory exchange of carp 

 with temperatures rising from 7 to 25. These experiments were 

 made in summer. Experiments made on the fishes in winter gave on 

 the whole lower results. Later experiments made by Lindstedt using 



c.c.02 



pf,r kg. and hour 



W 20 30 40 5O 



FIG. 24. Temperature and respiratory exchange of flies. After Battelli and Stern. 



the same apparatus have given somewhat more regular results for the 

 influence of temperature upon the respiratory exchange of various 

 fishes and invertebrates (fig. 23). 



Battelli and Stern's experiments on insects have been carried to very 

 high temperatures at which the respiratory exchange begins to show a 

 decrease. They have obtained the following results (Table XII) of 

 which those on larvae, chrysalides, and imagines of flies are shown 

 graphically in the curves (fig. 24). 



