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riment, for which the whole was begun; viz. the thaw- 
ing of the animals. This was done very gradually ; but 
the animals did not with flexibility recover life. While 
in this cold, they Ihewed figns of great uneafmefs by 
their violent motions. In fome of thefe experiments, 
where air was made the condudtor ot the cold and heat, 
that the heat might be more readily carried off from 
the animal, a leaden veffel w^as ufed. It w^as fmall for 
the fame reafon; and as it w^as neceffary, for the animal’s 
refpiration, that the mouth of the veffel fliould commu- 
nicate with the open air, it was made pretty deep, that 
the cold of the atmofphere round the animal might not 
be diminiflied faff by the warmth of the open air, which 
w'^ould have fpoiled it as a conductor. 
II. The fecond experiment was upon a dormoufe.. 
The veffel was funk in the cold mixture almoft to its 
edge. The atmofphere round the animal foon cooled; its 
breath froze as it came from the mouth ; an hoar-froft ga- 
thered on its whifkers, and on all the inflde of the veffel 
and the external ends of the hair became covered with the 
fame. While this was going on, the animal ihewed ligns. 
of great iineafinefs : fbmetimes it would coil itfelf into a 
round form, to preferve its extremities, and confine its 
heat; but finding that ineffeaual, it then endeavoured to, 
make its efcape <'"^;, its motions became lefs violent by 
{a) Thls.fhews^ that cold, earned to- a great degree, rather roufes the am- 
jpal intt> aftion than depreffes it; but it would appear, from many circumftances. 
and obfervations, that a certain degree of cold produces maftivity both in the 
^ving and fenfative principle, wliich will be farther illuftrated hereafter. 
ths' 
