294 



THE AMERICAN NATURALIST [Vol. XLI 



of the spiracle and neighboring parts (see page 299). After these 

 experiments the fish was exercised vigorously for a minute or so, 

 after which the rates were again observed. Following are the 

 results of the experiment. 



The high respiratory rate (47) iiiiiiuMliatcly after the hour's 

 rest a|)parently means that the fish ha<l not recovered from tiie 

 effects of th(^ e\})eriiiieius which preceded that horn*, a rate as high 

 as 57 having been iiuhiced in (he course of these t^xperiments. 



(4) In a skate immechately after exercise, conditions were as 

 shown in the following table. 



Inspirations Inspiriitions Spoutings 



This skate was then 

 small vessel of water, w 

 At the end of the three h 



