ANIMALCULA OF INFUSIONS. ^ 



CHAP. V. 



MORE ACCURATE AND EXTENSIVE CONSIDERATION 

 OF THE EFFECT OF HEAT AND COLD ON ANIMALS. 



JuLeat and cold, we have feen, are two agents 

 deflru6live of animals, when extended to a cer- 

 tain degree. We have alfo obferved, that all 

 fpecies do not perlih at the fame inteniity ; but 

 fonie can fupport more, and fome lefs, according 

 to the hardinefs of their conflitutions. All this, 

 however, has been viewed only on a narrov/ 

 fcale, and in a limited number of animals, and 

 even thofe occupying the lowefl rank in the fcale 

 of animation. Let us genera) ife our ideas, and 

 confider the fafts more at large. Let us run o- 

 ver the different clalfes and orders of animated 

 beings, beginning with man, the mod noble, 



the moll fublime, and mod perfe£t of all. — 



Such confiderations will afford an agreeable in-- 

 terlude, and lelfen the ennui which attends the 

 famenefs of a fubjeft. 



Though man, like other animals, being fub- 

 jed to phyfical laws, mud neceffarily be liable to 

 periln from excefs of heat or cold, he can fudain 

 a degree of heat that might be fuppofed infup- 



VoL. L E portable, 



