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1 88 Analyfis of the Air. 



and it was the fame in the diftillation of 

 Muftard-feed. 



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account of some experiments made 



on Stones taken out of human Urine 

 and Gall Bladders. 



HAVIVG, while thefe Sheets were 

 printing off, procured by the favour 

 of Mr. Ranby, Surgeon to His Majefy's- 

 Houjholdy fome calculi humani, I made the 

 following Experiments with them, which I 

 ihall here infert, viz. 

 • I diftilled a calculus in the iron retort 

 ( Fig. 38. ) It weighed 230 grains, which is 

 fomcthing lefs in bulk than £ of a cubick 

 inch : There arofe from it very briskly, in 

 diftillation, 5 1 6 cubick inches of elaftick Air ? 

 that is, a bulk equal to 645 times the bulk 

 of the Stone j fo that above half the Stone 

 was raifed by the action of the fire into elaf- 

 tick Air ; which is a much greater propor- 

 tion of Air, than I have ever obtained by 

 lire, from any other fubftances, whether a- 

 nimal, vegetable or mineral. The remaining 

 calx weighed 49 grains, that is T ^- 9 part 

 of the calculus % which is nearly the fame 



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