10 



CHARLES G. ROGERS AND ELSIE M. LEWIS. 



some further study. A glance at the table (Table III.) will 

 indicate the very close approximation of the temperature of the 

 clam to that of the water. In each case an hour or longer was 

 allowed for the animal to remain at a given temperature before 

 making the final reading. In the case of clam 3 it will be noted 

 that the temperature of the clam lagged somewhat behind that 

 of the water both while it was being warmed and being cooled. 

 But even here the difference of temperature between the animal 

 and the water is a matter of hundredths of a degree only. 



TABLE III. 



Clam Series Anodonta. 



EXPERIMENTS UPON SALAMANDERS DIEMYCTYLUS VIRIDESCENS 

 AND AMBLYSTOMA PUNCTATUM. 



Our experiments upon the small spotted salamander, Diemycty- 

 lus viridescens, gave very striking results. In working with the 

 specimens of this species a small wire collar was placed around the 

 body of the animal just back of the fore legs. The long ends of 

 the wire served as a convenient means of handling the animal 

 and for fastening it in the proper position on the glass-covered 

 junction of the thermo-couple. The animal was made to open 

 its mouth and the junction passed down the gullet till it came to 

 lie in the stomach. It was found that after an animal had been 

 through the operation a very few times it no longer made any 

 serious objection to taking the junction. When the animal had 

 been placed upon the junction the whole was then transferred to 



