3'2 ANIMALCULA OF INFUSIONS. 1. 



corrupted. The heat neither accelerated nor re- 

 tarded the exclufion of the eggs, for tadpoles were 

 hatched in the fame time as in thofe not expofed, 

 which had been referved for th'e purpofe of com- 

 parifon. 



Having afcertalned the heat which the eggs of 

 frogs could fuffer without injury to the tadpoles, 

 I had to examine what heat the tadpoles produc- 

 ed by them could bear ; however, they were 

 unable to refill as much, for all died at ii i°. 



Thefe experiments were repeated on adult 

 frogs. Although I had feveral fpecies, I prefer- 

 red thofe that had produced the eggs. They in- 

 habited the ditches of plains, were rather fmall 

 in lize, and greenifli on the back. Being put on 

 the fire, they had all liberty in the water ; they 

 could fwim at pleafure, and come to the furfacc 

 to refpire : but a covering prevented them from 

 efcaping. The whole periflied at nearly about 1 1 1 ". 



I know there are frogs that live in warm fprings, 

 though the heat is greater than i ii". Thus, the 

 illuftrious Cocchi relates, they are not injured in 

 the warm baths of Pifa,, where it is 1 1 1° by Fah- 

 renheit, which correfponds with 37° of Reaumur's 

 thermometer ( i ). But we muft either fay they 

 are of a different fpecies, or, being long accuf- 



tomed 



(i) There feems to be forae error here : 37° of Reau- 

 aiur's thermometer correfponds witli 115? of Fahrenheit. 

 • — T. 



