Il. coNFINED IN STAGNANT AIR. 79 
Caterpillars, and the larve of flefh-flies, con- 
fined in eleven inches of air, died before becom- 
ing chryfalids. The larve in particular, foon after 
confinement, deferted the putrid flefh put in along 
with them for food, and tumultuoufly traverfed. 
the veffel, difregarding the flefh. They became 
motionlefs, and died after various periods, longer 
or fhorter: if the veflel was larger, they lived 
longer ; if fmaller, they died fooner. Thefe lar- 
wee, when changed to nymphs, fuffered lefs ‘from 
the fmall quantity of air. In a veflel where the 
larve had died, I confined the fame number of 
their nymphs. ‘The flies of fome came out; but 
it muft be remarked, that the body and wings 
were diftorted : they feemed to have been pro- 
duced, as one may fay, again{t the will of nature. 
‘This never happened to the chryfalids of butter- 
flies, though the vacuum was very fmall. 
What has been hitherto faid will apply to 
feeds and eggs. I omit telling the reader my 
trouble in finding the fucceflive capacities of the 
veflels, where eggs and feeds ceafed to germi- 
nate ; but adopting the general refult, when the 
capacity of the veflels was but three or four 
inches, neither eggs nor feeds have developed. 
Thus it is neceflary to conclude, that the pro- 
dution of vegetables, and of fome animals, takes 
place nearly as well in confined as in open air, 
provided the quantity in the veffels is confider- 
able ; 
