IIL ‘cONFINED IN STAGNANT AIR. 71 
‘ {pheres, touching in feveral points; others ex- 
hibited a contraction, or rudiments of divifion 
hardly begun, on the outfide of the body. 
The duration -of life, and the multiplication 
obferved in infufion animalcula, were likewife 
feen in the anguillae of vinegar confined in clofe 
veflels. ‘From the ‘beginning of April to the 
end of November, they were vifible, and .conti- 
nually -became more numerous. It is true, as 
winter advanced, the-eels perifhed; but the fame 
happened to thofe of vinegar in the open air, 
which was occafioned by the increafed.cold. We 
‘know that vinegar is without eels during <winter. 
- While I made thefe experiments, the water of 
feveral ditches was full of worms, infects, and the 
tadpoles of frogs. On them were repeated the fame 
experiments as had been made on the animalcula 
of infufions and the eels of vinegar. I began 
with the larve of mufkitoes. Many were con- 
fined in veffels with ditch water, that they might 
find aliment among the quantity of heterogene- 
ous matter which it was full of. The larve 
fuffered nothing from confinement: all changed 
+o nymphs, which in time produced the flies. 
- Tadpoles were alfo confined in veflels, along 
with a fuflicient quantity of water, and marth len- 
til for food. For twenty-four days, their fize en- 
_ereafed confiderably ; and they died lefs from 
ftagnation of the air, it is probable, than be- 
La eaufe 
