Analyfis of the AW. 193 



from nitre loft little of its elafticity, where- 

 as moft of the air obtained from nitre, in 

 diftilling with the receiver (Fig. 33.) was 

 reforbed in a few days, as was alfo the air 

 which was generated from detonized nitre 

 in Experiment 102. Hence alfo we fee the 

 reafon why 19 parts in 20, of the air which 

 was generated by the firing of 'Gunpowder> 

 was in 18 days reforbed by the fulphureous 

 fumes of the Gunpowder ; as Mr. Hawksbee 

 obferved, in his phyfico-mechanical Experi- 

 ments, page 83. 



In the diftillation of Horn, it was obferv- 

 able, that when towards the end of the ope- 

 ration the thick fetid oil arofe, it formed 

 very large bubbles, with tough unctuous 

 skins, which continued in that ftate fome 

 time ; and when they broke, there arofe 

 out of them volumes of fmoak, as out of 

 a chimney, and it was the fame in the di- 

 ftillation of Muftard-feed. 



An Account of some Experiments mace 



on Stones taken ou iof human 

 Urine, and Gall-bladders. 



H 



Aving procured, by the fivour cf Mr. 



Ranb\\ Surgeon to His Majeflys 



O Houf/old, 



