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amined the air on Monday between 

 one and two o'clock, when it ap- 

 peared, by the nitrous tell, about as 

 good as common air ; and yet it 

 had not loft its explofive quality. 

 After this, I replaced the jar as be- 

 fore, in the garden, and put the 

 fame air again to the teft between 

 four and five in the afternoon of 

 the fame day, when it appeared to 

 be better than common air, without 

 having loft its explofive force. 

 There remained now nothing more 

 to be done, than to try the effect of 

 this air upon a living animal. I 

 placed a lively chicken 5 three weeks 

 old, in a jar filled with this air : it 

 grew fick directly, and was in fix 

 minutes near dying, when I took it 

 out quite motionlefs. It remained 

 in the open air during feveral mi- 

 nutes in a dying condition, after 

 which it gradually recovered. 



I was 



