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they even would not allow the win- 

 dows of the fchool to be opened, for 

 fear that the young air, as they 

 called it, of the fchool-boys fhould 

 efcape ; thinking that breathing this 

 infectious and truly noxious evapo- 

 ration would prolong their own 

 life. 



As I found that the bubbles ap- 

 pearing upon the fkin, when a part 

 of our body is plunged under water, 

 are fo much the larger as the part 

 is put the more precipitately in the 

 fluid, I could fcarce doubt but the 

 air gathered from thefe large bub- 

 bles mull be for a great part atmo- 

 fpheric air, which could not fo 

 quickly detach itfelf from the fkin 

 by the fuddennefs of the immer- 

 sion ; and I expected, therefore, that 

 this air would give by the nitrous 

 teft a better appearance than that 

 K 4 gathered 



