34 SEMINAL VERMICULI. Th: 
repeated during winter: They~ conftantly. prov- 
ed, that the duration of motion was proportioned, 
to the temperature of the atmofphere. 
In profecuting my experiments on the femen of 
the horfe-in fummer, a thought occurred of fub- 
jecting vermiculi to the cold of freezing, by im- 
merfing the glafs that contained them in fnow. 
The fame effect was produced as by the winter’s 
cold, that is, in fourteen minutes, it made them 
motionlefs; though, when expofed in another: 
slafs to the heat of the atmofphére, they moved: 
feven‘hours anda half. An accident: that hap-: 
pened ‘inthe fummer experiments affordéd: new 
intelligence, and divefted me of a prejudice. Ob- 
ferving that the vermiculi had become motionlefs,’ 
I took the glafs from the {now, and left it expofed- 
to the air at 81°.. An hour after, it aftonifhed: 
me to find all the vermiculi reanimated in-fuch a: 
manner as if they had juft’come from the feminal 
veffels. I-then perceived the cold had not been- 
fatal; but had reduced: them to a ftate. of com-: 
plete inaction.. ‘They were replaced among: the: 
fnow, and in three quarters of an- hour being, 
taken out, I-obferved thefe phenomena: In a few- 
minutes, their vivacity relaxed, and the diminu-: 
tion increafed until they loft the motion of pro~ 
grefion, and retained that of ofcillation only,. 
which alfo ended in a few minutes more. Ex-- 
actly: the reverfe was feen, when they paffed from: 
, the. 
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