iy. Some Obfemtions upon Mr. Sutton’s In- 
vention to extratf the foul and flunking Air 
from the Well and other ‘Parts of Ships, 
with Critical Remarks upon the Ufe of 
Windfalls, hy William Watfon, F. R. S. 
London , Dec. 4. 1741.' 
Read Aj>ni i. AS nothing is more conducive to the 
il Health of the human Body, than 
taking a fufficient Quantity of wholfonie Air into 
the Lungs, fo the contrary is attended with perni- 
cious and often with deftru&ive Confequences. 
One of the great Ufes of Air in Inspiration is, to 
cool the Blood palling through the Lungs, where 
Nature has provided, according to the excellent Mai - 
pighiusy that the Blood Ihould be diflributed through 
a vaft Number of exceedingly fine Arteries, which are 
applied all round the thin Veficles of the Lungs 5 and 
by this means the Blood is expofed to the Air under 
a prodigious large Surface, whereby the Putrefa&ion 
is prevented, which, from the alealefeent Quality of 
that Fluid, would othervvife be fpeedily deftru&ive. 
Obfervations inform us, that contagious Diftempers 
are morofrequent in hot Climates than cold ; and 
in clofely built Cities fully inhabited, than in Towns : 
The former may, in fome meafure, proceed from the 
too great Heat of the Air, not fully anfwering the 
above-mentioned Purpofesj and the latter from too 
many People breathing in the fame Atmofphere, 
thereby rendering it unfit for Refpiration. 
It 
