■^ ANIMALCULA OF INFUSIONSi- IfS^ 



{elves, the nymphs and larvae of mu(kItoes, and 

 to water nevs^ts : io8° kills filk- worms and the 

 larvae of the blue flefh fly: 106° kills leeches^ 

 rat-tailed worms, and water fleas : and animal- 

 cula die at about the fame degree of heat, that 

 is 106% 108°, 111°, 



All animalcula are not alike affeded by cold* 

 Some die at freezing, or a degree not much, 

 greater ; others furvive at io**> Thus is it with: 

 infeds. Winter defliroys mofl; of them, but many 

 brave its rigour, and fome retain the ufe of their 

 members, as is feen in various fpecies of infufion^ 

 animalcula. During fummer, I have often fro- 

 zen water in a concave glafs where different little 

 infeds fwam. Freezing began at the circumfe- 

 rence, and formed a v/reath of ice : but the in- 

 fers never remained to be imprifoned in it ; they 

 retreated to the interior where the water was yet 

 fluid, and, as freezing advanced, collefted in the 

 centre of the glafs, where they periflied on com=. 

 plete induration of the fluid. Infufion animalcula 

 exhibit prccifely the fame phenomena. 



The odours and liquors that are a virulent 

 poifon to infe6ts, are the fame to animalculao 

 Such is the odour of camphor, the fumes of tur» 

 pentine, fulphur, and tobacco. Oleaginous, fpi- 

 ritous, and faline liquors are equally deftrudive,. 

 The eledric fpark is a real thunderbolt to both,. 

 Agents flowly deftrudive of infufion animalcula 



are 



