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Chy. p 45 ; confequently 129 grains water require 18,497 °^ ^7' 

 drogen, confequently there remained 15,3 grains of hydrogen for 

 the formation of about 100 grains more of water, which were loft. 



5th. Lavosier afligns to 100 grains of fully oxyginated ni- 

 trous acid about 64 of nitrous air and 36 of acidifying oxygen ; 

 but in its common ftate of oxygination we may afllgn it 25 only 

 of fuperadded oxygen ; and confequently 100 grains of the com- 

 mon acid contain 75 of nitrous air and 25 of acidifying oxygen. 

 Nitrous air itfelf contains about | of its weight of oxygen, and 

 i mephite. i Lav. Elcm. 235, and Mem. Par. 1781. 



Now 1 00 grains water require for their formation 85,662 of oxy- 

 gen, therefore 229 grains of water would require 196,16 ; but 409 

 grains nitrous acid, fuppofing it even fully oxyginated, contain no 

 more than i4-",24ofacidifying oxygen, therefore the remainder f.z. 

 48,92 mull have been extracted from the nitrous air, and much 

 more, if we fuppofe the nitrous acid to contain but 25 per cent, 

 of acidifying oxygen; for then the nitrous acid Would fupply but 

 1 02. 2 5. and confequently 93,91 fhould be taken from the nitrous air. 



Now, according to the experiments of Dr. Prieftly and Dieman, 

 if much oxygen be fubftradled from nitrous air it will be con- 

 verted into rudimental nitrous air ; thus this converfion, and the 

 quantity of water found, are adequately accounted for on the 



theory aboT€ laid down. 



The 



