the Natural Hiftory Part X^, 



Sm out of the Body of the Earth up 

 into the Atmpfphere : but more efpe- 

 cially in thole Parts of it where there 

 are Arfenical, or other like nQ)cic(U.§ 

 Minerals lodged underneath. That 

 thefe mingling with, and being diffe- 

 minated in, the Air, and paffing toge- 

 ther witli it into the Lungs in Refpira- 

 tion, are by them tranfinitted into the 

 Body, where they infeO: the Mais of 

 Blood, create Perturbations and dilbr- 

 derly Motions therein, and lay the 

 Foundation of Peftilential Fevers, and 

 other malignant Dijlempers. That 'tis 

 for this reafbn that the Southern Coun- 

 tries are more frequently molefled and 

 incommoded by thefe Diftempers than 

 the Northern are : and that they are 

 more rife and ftirring in the hotter 

 Months, in July and Mgufit than in 

 the colder, December, 'January, and the 

 reft. That 'tis indeed true, that in 

 September and OSiokr, which are none 

 of the hotteft Months, thele Diieafes 

 are oftentimes as epidemical as in the 

 precedent and warmer Sealbn : and do 

 not abate and remit in proportion to 

 the remiflion of the Sun's Heat in thole 

 Months ; but this is purely accidental, 

 and happens meerly becaufe the Heat 



with- 



