Til. CONFINED IN STAGNANT AIR. 81 
On the fame day, a fimilar experiment was 
made with leeches. I confined four in each vef- 
fel. They lived long in comparifon to the newts. 
In the {fmalleft veffel, they died in three days ; in 
_ ‘the next, in nine ; and in the largeft,’in thirty- 
two days. 
The experiment was repeated, 12 May, on 
both kinds of animals. ‘They died much fooner. 
The newts, in the fmalleft veffel, perifhed in 
-twenty-feven hours ; in the next, in three days ; 
and in the largeft, in four days. The leeches, in 
the fmalleft veflel, died in two days; in the next, 
in five; and in the largeft, in nine. The more 
immediate death of the newts and leeches in May, 
I fufpetted was occafioned by the increafed heat 
of the feafon ; for, during the month of April, 
in the greateft heat, the thermometer rofe to 57°, 
while, in May, it ftood at 70°. My fufpicions 
were realifed by the death of the animals being 
accelerated in June and July. The thermometer 
ftanding at 81°, during the latter, four newts in 
the largeft veffel died in twenty-three hours, and 
the leeches in thirty-five. 
_. What has been faid of leeches and newts will 
apply to fnakes, vipers, and fifhes ; becaufe the 
refult of experiments made on them correfpond- 
ed with the former. The death of the whole 
was not only accelerated in proportion to the 
{ma]l quantity of air they were forced to refpire, 
Vat. Il. i but 
