4io 



L. H. HVMAN. 



the animals had been on hand in the collecting department for 

 some time before I obtained them. 



Since the first experiments showed that some little time was 

 required for the penetration of even relatively concentrated 



TABLE III. 



ACTION OF POTASSIUM CYANIDE ON THE OXYGEN CONSUMPTION OF 

 Chcetopterus pergamentaceus. 



Oxygen Consumed, Cubic Centimeters per Hour. 



TABLE IV. 



ACTION OF POTASSIUM CYANIDE ON THE OXYGEN CONSUMPTION OF 



Arenicola cristata. 



Oxygen Consumed, Cubic Centimeters per Hour. 



solutions of cyanide into these animals, presumably because of 

 their thick body walls, the practice of leaving them for an hour 

 or two in the cyanide solution before carrying out the test was 

 adopted. 



