124 WONDERS OF ORGANIC LIFE. 



ing itself, it will certainly perish. If we subject 

 an animal hybernating in a state of torpidity 

 to excessive cold it will revive, and probably 

 die ; and here cold seems to act as an increase 

 of temperature would do. Mangili placed a 

 torpid marmot, which had been kept in a 

 temperature of 45°, in a jar surrounded with 

 ice and muriate of lime, so that the temperature 

 of the jar rapidly sank to 16°. In about half 

 an hour, the respiration of the animal became 

 quickened, and it exhibited symptoms of re- 

 turning animation. In sixteen hours, it was 

 completely revived, and made many efforts to 

 escape. He also placed a bat under a bell- 

 glass, where the temperature was 29°, and 

 where it had free air. Eespiration soon became 

 painful, and it attempted to escape. It then 

 folded its wings, and its head shook with con- 

 vulsive tremblings. In an hour no other 

 motions were perceptible than those of respira- 

 tion, which increased in strength and frequency 

 until the fifth hour. From this period the 

 signs of respiration became less distinct, and by 

 the sixth hour the animal was found dead. He 

 also exposed a torpid dormouse, from a temper- 

 ature of 41° to a cold of 27° produced by a 

 freezing mixture. Inspiration increased from 

 ten to thirty-two times in a minute, and with- 

 out any intervals of repose. There were no 

 symptoms of uneasiness, and the respirations 

 seemed like those in natural sleep. As the 

 temperature rose, respiration became slower. 

 He then placed it in the sun when it awoke. 



