SS 
al i 
ee et j 
corruption is checked. by tus vital 3 
‘operation of the plants in the fum. 
mer, and. by. the cold in the winter. 
_ By_ this obfervation, we may per- 
haps be induced to believe, that 
‘thofe countries which are very hot 
in the fummer, and are little or not 
cultivated, as is a great part of 
Hungary and the country round 
about Rome, are not only expofed 
to have their air contaminated by 
breathing of animals in it, and 
es the corruption of many other 
fubftances, but alfo by the corrup- 
tion which the air itfelf is liable to 
undergo during the heat of the 
feafon; and which mifchief can 
chiefly be remedied by making a 
fuficient quantity of vegetables 
grow in them, principally trees. 
Draining the marfhes, and prevent- 
ing inundations by keeping the ri- 
oe ae vers 
ae 
