Analyfis of the Air. 195 



By comparing this diftillation of the cal- 

 culus with that of RemJJj Tartar, in Expe- 

 riment 73, we fee that they both afford more 

 air in diftillation, than any other fubftances : 

 And it is remarkable, that a greater propor- 

 tion of this new raifed air from thefe two 

 fubftances, is reforbed, and lofes its elafti- 

 city, in {landing a few days, than that of any 

 other bodies -, which are ftrong fymptoms 

 that the calculus is a true animal Tartar. 

 And as there was very confiderably lefs oil, 

 in the diftillation of Remjh Tartar, than 

 there was in the diftillation of the feeds and 

 folid parts of vegetables; fo I found that 

 . this calculus contained much lefs oil than 

 the blood or folid parts of animals. 



I diftilled in the fame manner as the above- 

 mentioned calculus, fome ftones taken out 

 of a human gall bladder j they weighed fifty- 

 two grains, fo their bulk was equal to ^ part 

 of a cubick inch, as I found by taking their 

 ipecifick gravity. There were 108 cubick 

 inches of elaftick air raifed from them in 

 diftillation, a quantity equal to 648 times 

 their bulk; much the farrae quantity that 

 was raifed from the calculus. About i. part 

 of this elaftick air was in four days reduced 

 into a fix'd ftate. There arofe much more 



O 2 oi 



