L ^NIMALCULA OF INFUSIONS, 9? 



Such a one may perhaps afcertain the truth. If, 

 after being deprived of the blood, this animal 

 does not become torpid on expofure to cold, 

 then the fole caufe of torpidity Ues in the refri- 

 geration of the blood : if torpor does enfue, we 

 cannot recur to the refrigeration of the blood, 

 but to that of the folids, or to ;he inJluence that 

 cold has on them. An animal of this kind is not 

 only polTible, but it exifts, — there arefeveral, as, 

 frogs, toads, tree frogs, and water iiewts. In 

 my experiments I have obfcr/ed, that all the 

 blood being difcharged from the opened heart or 

 divided aorta, thefe animals ftill leap for many 

 hours, run, dive in water, and fwim to the top, 

 retain a lively fenfe of fight and feeling ; in a 

 word, continue the exercife of every corpora! 

 fundion that they had before ( i ). I now repeated 

 the experiments, and Began with frogs. — Several 

 very vivacious were buried in fnow ; part were 

 untouched, and part of th« number deprived of 

 the blood, by endeavouring to evacuate it com- 

 pletely from the heart and large veifels. In eight 

 or ten minutes, fome were examined : the blood- 

 ed and thofe entire were exadly in the fame 

 flate, that is, half dead, and not attempting to 

 efcape, though at liberty. In fifteen minutes, I 



drew 



( I ) Thefe experiments are fpoken of in my work, D^ 

 f enomeni dclla Circolazione. 



