!, ANIMALCULA OF INFUSIONS. If 



the intenfity of heat the feeds would be expofed 

 to. 



Recoiirfe was had to another experiment to 

 iearn whether an encreafe of heat would obflrudt 

 the production of animalcula. The eleven fpe- 

 cies of feeds were flowly heated in a coffee roafter 

 till they became pretty well roafted, and eleven 

 infufions formed of them with water previoufly 

 boiled as ufual. But this heat, fo much more 

 intenfe, neither prevented the origin of animal- 

 cula nor leifened the number^ They were rare 

 at hrfl ; but about the middle of October, that 

 is, twenty days after making the infufions, the 

 fluid was fo full as abfolutely to appear animat- 

 ed. 



The conftancy of their appearing even here, 

 excited my curiofity to augment the heat flill 

 more. The feeds were burnt and ground the 

 fame as we burn and grind coffee. Of the dull, 

 which refembled foot, I made as many infufions 

 as different kinds of feed : Hkewife, an infufion 

 was made of the yolk of an egg, which by the 

 thermometer had fuffered 279° of heat (i). What 



followed ? 



( I ) The author iifed Reaumur's thermometer in all his 

 experiments. As Fahrenheit's is the only thermometer 

 ufed in this country, the degrees of heat are here reduced 

 to his ftandard, 2.25 of Fahrenheit being equal to 1° 

 of Reaumur. The fracTiional parts of the former are not; 

 given, both becaufe experiments can feldom be made with- 

 in 



