b8 ANIMALS AND VEGETABLES iff, 
number. But when the frogs were in water, 
they conftantly perifhed fooner as their number 
was greater: eight died firft, then four, and laft- 
Sy two. It happened only once that all the eight 
were alive, when one in the veffel with four was 
‘dead. 
From all thefe faéts, added to thofe related by. 
Sig. Cigna, I was fatisfied that frogs corroborate 
the general rule, that all animals, without excep- 
tion, perifh in confined air fooner according as 
their number is increafed. However, we fee dif- 
crepancies with frogs included in veffels without 
water: but I know not whether they fhould 
really be confidered fuch, becaufe privation of 
water is injurious to thefe animals, which Sig. 
Cigna remarks. Frogs die in a fhort time in open 
veflels wanting water: therefore it is abfolutely 
neceffary to profcribe this as a caufe difturbing 
our experiments. 
After finding the reafon why differences ap- 
peared with frogs, perhaps it would not be diffi- 
cult to find it in Piftorini’s animals, had he men- 
tioned what they were, and the manner of con- 
ducting his experiments, With refpect to Sig. 
Veratti, we know that he generally ufed birds. 
But he has found, that they, as I have myfelf 
done, and fhall foon obferve, agree well with the 
yule laid down. ‘Thus there is room to fufpe@, . 
that Piftorini’s experiment has met with fome ac- 
cident, 
aoe 
rene Se 
SS ee 
