[cameron-brownleeJ low TEMPERATURES ON THE FROG 



123 



Experiment 21. Mar. 2Sth. 

 Time 



12.30 pm. 



45 

 1.00 



15 



30 



50 

 2.00 



10 



20 



30 



40 



50 

 3.00 



10 



20 



30 



40 



50 

 4.00 



10 



20 



30 



40 



50 

 5.00 



The frog was removed at 5.00 p.m., had partially recovered at 6.30 p.m., 

 and completely recovered at 8.00 p.m. It can therefore survive slow cooling to 

 -1-0°C. 



Experiment 22. April 8th. In this experiment the frog was cooled as usual. 

 The internal temperature showed an initial supercooling effect. 



Time 



2.45 p.m. 

 3.00 

 3.15 

 3-18 



Externnl 



-1-6°C 

 1-8 

 22 

 2-3 



Temperature 



Internai 

 + 0-5°C 

 —0-3 



0-8 



0-5 



The internal temperature then remained constant at — 0-5°C. till 11.30 p.m. 

 a period of over eight hours. During this time the external temperature was kept 

 between —1-3° and 2-5°C. The frog was removed from the apparatus at 10-45 

 p.m. At 12-55 a.m. it had almost recovered, and at 10.15 a.m. of the 9th April 

 it had completely recovered. 



The frog will therefore survive prolonged coolingatits freezing point temperature. 

 During the period of freezing it is completely stiff. 



Sec. IV, 1913—8 



