STUDY VII. 41 



ingly wîiolefome ; fuch as the Ifle of France, of 

 Bourbon, of St. Helena, and others. 



As the corruption of the air is a fubjed pecu- 

 liarly intending, 1 Ihail venture to fuggeft, by the 

 way, lome lirnple methods of remedying it. The 

 firft is, to remove the caules of it, by fubftitutins;. 

 in place of the Itagnant puddles with which our 

 plains abound, the ulb of cifterns, the waters of 

 which are fo lalubrious, when they are judicioufly 

 confiruéled. They are univerfally employed all 

 over Afia. Care fhould, likewife, be taken to pre- 

 vent the throwing the bodies, and other offal, of 

 dead animals into the layftalls of our cities ; they 

 ought to be carried to the rivers, which will be 

 thereby rende; ed more productive of fifli. In the 

 cafe of Cities which are not wafhed by rivers to 

 carry off the garbage, or if this method is found 

 otherwife inconvenient, attention {hould be paid, 

 at leaft, to placing the layftalls only to the North 

 and North-eaft of fuch cities, in order to efcape, 

 efpeciully during Summer, the fetid gufts which 

 pafs over them from the South and South-weft. 



The fécond is, to abftain from digging canals. 

 We are well acquainted with the maladies which 

 have refulted from thofe of Egypt, in the vicinity 

 of Rome, and elfewhere, when care is not taken 

 to keep them in repair. Befides, the benefits de- 

 rived 



