I. ANIMALCULA OF INFUSIONS. §7 



demonflrates the heat of both to be the fame as 

 our own (i.) 



As it was not then in my power to have mar- 

 mots at pleafure, I defired a much refpeded 

 friend, who could eafily obtain them,to undertake 

 fimilar experiments (2). He did fo ; and the re- 

 fult proved, that marmots are not cold blooded, 

 as M. De Buffon had fuppofed, but are endowed 

 with an internal principle of heat, equalling that 

 of other animals. He was pofitively aflured of 

 it, by keeping the thermometer in the axilla of 

 two marmots. The heat of one raifed ' it to 90'' 

 in eight minutes, 20° above the temperature of 

 F 4 the 



(i) Hunter found the heat of a dormoufe 80° and 85^*, 

 •when the heat of the atmofphere was 50° or 60° ; when 

 the animal was lively, 91° or 93°. A thermometer intro- 

 duced within the body and applied to the pelvis rofe to 99^^, 

 the atmofphere at 66". The monfe being put an hour in 

 an atmofphere of 13°, it rofe to 83". 



In hedge-hugs, he obferves, Mr Jenner found the heat 

 48", when they were torpid or the atmofphere 44", and 

 the heat only 30° in an atmofphere of 26°. But expofed to 

 this cold two days, the heat in the rectum was 93^. So far 

 from being torpid a hedge-hog Avas lively, and the bed en 

 ■which it lay felt warm. Whence he concludes that ex- 

 ceffive cold roufes the vital povv'ers. — Obfirvations on the Ani- 

 vial Economy — T. 



(2) Sig. Giannambroglo of Milan an able chemiil:, al- 

 ready well known in the republic of letters, by a moft e- 



laborate 



