438 ESSAYS Any OBSERVATIONS 
- or expells the latent feeds of difeafes, be 
foye they are, by time and accidents, \per- 
fected and put into action, but caufes 
fuch an alteration of the humours as'may 
make them lefs fufceptible of any morbid 
impreflions : And the veffels being fo foon 
accuftomed, before they become rigid, to 
certain motions and extenfions, the body 
is rendered ever after: more paflive to the 
impulfes of any fubfequent diftemper ; 
which therefore will be attended with lefs 
danger. This is agreeable to experience; 
for one who has fuffered ‘an acute illnefs 
will bear ficknefs better than another who 
never liad the diftemper, and belefs over= 
come by it. . 
From fuch reafoning it will feem to 
follow, that the fooner inoculation can 
be performed with fafety, the greater will 
_ be the advantage. I cannot affert, that 
to this is owing the more than ordinary 
healthfulnefs of the inoculated with us, 
and that fo few of them are dead: But if 
nothing. forbid, I always advife it, the 
child yet unwearfed; and with me it has 
always, happily and pleafantly fucceeded. 
Though 
