L ANIMALCULA OF INFUSIONS. or 



. ticularly at 97°, they became reftlefs ; at 99°, they 

 ceafed to move ; and at 108°, all had perifhed. 

 The eggs producing thefe animals long refifted 

 the influence of heat : at 88°, they produced the 

 greateft pofTible number of worms ; at 99^, 

 many, but fewer than before ; and the number 

 always diminifhed as the heat encreafed : at 144'', 

 not one was fertile. The eggs and caterpillars 

 of the elm butterfly perfedly correfponded with 

 the filk-worms. It would be fuperfluous to fay 

 more of them ; and I pafs to my experiments on 

 the large- fly. 



The fpecies was that which depofits the eggs 

 on flefli either putrid or tending to putrefy. 

 Until 124°, a great many produced worms ; at 

 135° and 138^^, very few; and all were ftcrile 

 at 140°. The larvae of thefe eggs, at 88°, began 

 to be reflilefs, and endeavoured to efcape : their 

 agitation encreafed at the fubfcquent degrees ; 

 and at 108° all had periflied. Full grown 

 worms of die fame kind died at 108° alfo ; 

 Changed to nymphs and flies : the latter bore 

 the heat word of all ; 99° degrees killed them. 

 Flies came from nymphs at 104° and 106° ; but 

 none at 111°: having opened them, I found the 

 heat had entirely dried them up. 



And this much being faid with refped to ani- 

 mals, and their eggs, expofed to difl'erent inten- 

 C a fities 



