4l2 On the Theory of Mixed Gasr.T. 



favours the theorem, which is imphcated in the 

 same charge with the hypothesis, by consti- 

 tuting it the sole judge of the evidence brought 

 against them. The surmise also accuses a 

 stranger, apparently in an unguarded manner, ■ 

 of being unacquainted w^ith the simplest doc- 

 trine of Hydrostatics and Pneumatics ;' though 

 this stranger has had the honour of being in- 

 troduced to the philosophers of England, by 

 Mr. Kirwan ; who moreover pays him the 

 CompKmeht of giving a decided preference to 

 his e:^tperiments upon the elastic force of va- 

 pour. 



V A table wnll be inserted in the postscript, to 

 ^I)rove, that Mr. Schmidt has changed the 

 presstire" of hrs apparatus frequently, if he 

 changed it at all. THe 'truth is, there is every 

 reason to suppose, he used the mean weight of 

 the atmosphere ; but as Mr. Dalton has called 

 the circumstance in question, this part of the 

 dispute may be properly left to the parties con- 

 cerned in it ; and the event cannot prove of 

 any moment to me, because the following 

 extract from my friend's letter will shew the 

 innrpression that has been made on his senti- 

 ments, by the experiment with the .moist 

 bottle ; at' the same time, he does not appear 

 to be fully Sensible of the change, which they 

 have liridcrgo'ne. — *^ With regard to yoUr' own 



