$4 + ANIMALS AND VEGETABLES Tits 
in water. If terreftrial, they were put ina veffel _ 
which was fufpended by a hook at the top of the 
receiver. 
My firft experiments were on frogs. patie 
were confined in one receiver, and air left, equal 
in bulk to a pound of water. In half an hour, 
the water began to rife above the level of that 
without, evidently proving that the elafticity of 
the internal air was affected. The afcent conti- 
nued until all the frogs were dead or dying. 
The water had rifen eleven lines. I repeated the 
experiment with four frogs confined in the receiv- 
er. When the whole were dead, the water had 
afcended ten lines. ‘The elevation was one line 
higher in an experiment with two frogs. It was 
nine lines with only one frog. 
I made fimilar experiments on newts, referving 
the fame quantity of air in the receiver as for 
frogs. The death of eight newts raifed the wa- 
ter fcarcely an inch ; of four newts, nine lines ; 
of two, fix lines ; and of one, five lines. ‘The e- 
levation of the water, therefore, diminifhed with 
diminifhing the number of newts. 
By the death of eleven leeches, the water cals 
five lines and a half, and by the death of three 
only one line. 
Several naturalifts have remarked ens tah 
fmall animals injure the elafticity of the air. I 
had alfo obferved this in birds: Veratti’s: re- 
fearches: 
