[ 275 ] 
doors with one of nitrous air occu 
pied 1.06; whereas that ex pofed 
to the fun occupied 1.082, 
I muit however acknowledge, that 
this experiment ought to be repeated 
more than once, to put the faé out 
of any doubt. I made it the very 
lait day of my ftay in the country, 
and thus had no time to repeat it, 
