[cameron-brownlee] low temperatures ON THE FROG 



121 



measured with a D'Arsonval galvanometer. The following experiments were per- 

 formed with this apparatus : — 



Experiment 19. April 3rd. 

 Time 



•10 p.m. 

 25 

 40 



45 

 315 



40 

 4-00 



20 



45 

 5-00 



10 



20 



30 



50 

 6.00 



10 



20 



30 



40 



50 

 7-05 



15 



25- 



35 



45 



55 

 8-05 



15 



30 



40 



50 

 9-00 



At 9.00 p.m. the frog and cylinder were removed from the cooling 

 apparatus. 



At 10 . 45 p.m. the frog was still not completely thawed. The internal temper- 

 ature was -0 . 4°C. The abdomen contained ice apparently. The limbs were soft. 

 At 11 . 35 p.m. there was still no sign of life. The heart was exposed, and found to 

 be beating slowly. On stimulation it commenced to beat more rapidly. The hind 

 limbs were dead. The muscles in the fore-part of the animal still responded to 

 stimulus. 



The frog therefore will not survive a temperature varying f rom-2° to -2 . 4°C. 

 for 1| hours. 



