for recovering Perfont apparently drowned \ 421 
diminution of life by cold. The fame phenomena take 
place in animals who have been very much reduced by 
hunger. ,, ; . 
^ a hzard, or inake, when it goes to its autumnal 
hiding place, is not iiifficiently fat, the Jiving powers 
become, before the Jeafon permits it to come out, very 
considerably weakened, and perhaps fo much as not to 
he again reftored. If thole animals, in fuch a ftate, are 
expoied to the Sun’s rays, or placed in any fitriation which, 
by its warmth, would give vigour to thole of the fame 
kind, which are ppffelfed of a larger fhare of life, they 
will immediately drew ligns of increafed life, but quickly 
fink under the experiment and die; while others, re- 
duced to the fame degree of weaknefs, as far as appear- 
ances can difcover, will live for many weeks, if kept in a 
degree of cold proportioned to the quantity of life they 
poffefs. v ^ 
I obferved many years ago, in fome of the colder parts 
of this iiland, that, when Jiitenfe cold had forced black- 
birds or thraflies to take Ihelter in out-hduies; any of 
thole that had been caught, and from an ill-fudged coni- 
paliion expoied to a coniiderable degree of warmth, died 
very loon . 1 he reafon of this i I did not then conceive ; 
hut I am now fatisfied, that it wafe owing, as in the other 
inifances, to the degree ot heat being increased too fud- 
denly for the proportion of Jife remaining in the animal; 
From thelc ladfs it appeals, that warmth caules a 
greater exertion of the living poweps tji.axi cold;, and that : 
an animal, in a weakly ilate, may.be obliged hv it to exert 
K k k 2 
a quantity 
