[cameron-brownleeJ temperature AND THE FROG 



79 



abdominal vein showed the corpuscles normal and no sign of laking. 

 On opening the thorax the heart was found to be soft, congested, 

 and stopped. It responded to stimulation but did not continue to 

 beat. 



Experiment 59. April 20th, 1915. External temperature 

 22-l°C. The frog commenced to breathe more rapidly when placed 

 in the air chamber. After 10| hours the frog was apparently dead 

 and was removed. On removal there was no sign of life, but after 

 a few minutes the heart commenced to beat. Breathing commenced 

 two or three hours later, and the frog recovered. 



Experiment 60. April 21st, 1915. External temperature 22-1° 

 C. After 15 hours the frog was breathing normally. After 23 hours 

 it was apparently dead. It was removed and allowed to cool slowly 

 to room temperature. Examined 2^ hours after removal it showed 

 no trace of recovery. Electrical stimulation through the skin evoked 

 the usual response. The heart-beat was very faintly visible though 

 the wall of the thorax. There was no recovery after a further 12 

 hours. 



Experiment 61. April 23rd, 1915. External temperature 

 19-3°-20-0°C. (for the most part between 19-3° and 19-4°C.) Dura- 

 tion of experiment 36 hours. The frog did not lose consciousness. 

 It was left in the air chamber after removal from the thermostat, 

 and so allowed to cool slowly to room temperature. 3| hours later 

 it was taken from the air chamber, and was unconscious, only a faint 

 heart beat being visible. Three hours later it commenced to recover, 

 and had completely recovered in a few minutes. It was kept under 

 observation for a week and remained perfectly normal. The result 

 indicates that apparently a slightly longer time at the temperature 

 of the experiment would have given a fatal result. The after effects 

 may have been apnoeic owing to a perhaps slightly increased rate of 

 breathing during the experiment, though it is doubtful if this would 

 have caused unconsciousness for a period of three hours. 



The results of the experiments 16 to 61 inclusive may be sum- 

 marized in the following table. 



