Ls rgg7 3 
they even would not allow the win- 
dows of the fchool to be opened, for 
fear that the young air, as they 
called it, of the {chool-boys fhould 
eicape; thinking that breathing this 
infectious and truly noxious evapo- 
ration would eRe: their own 
life. 
As I found that the bubbles ap- 
pearing upon the fkin, when a part 
of our body is plunged under water, 
are fo much the larger as the part 
is put the more precipitately in the 
fluid, I could fcarce doubt but the 
air gathered from thefe large bub- 
bles muft be for a great part atmo- 
fpheric air, which could not fo 
quickly detach itfelf from the fkin 
by the fuddennefs of the immer- 
fion; and I expected, therefore, that — 
this air would give by the nitrous 
teft a better appearance than sliat : 
