^g<^ ELASTIC FLUIDS. 



gas in it was partly driven down the lube mto the other 

 phial, by which, and the previous procefs, the nitrous gas 

 was completely falurated and nothing but azotic with a frnail 

 portion of oxigenous were found in the under phial : the 

 remaining gas in the upper phial was ftill i oxygenous. 



4. Nitrous gas and hydrogenous : in three hours the upper 

 phial was -^ nitrous, and of courfe the under mufi have a like 

 part of hydrogen, 



5. Nitrous gas and azotic : after three hours the upper phial 

 was ^ nitrous. 



In the two laft experiments, the quantity of nitrous gas in 

 the upper phial was lefs than might be expelled ; but tlie (ube 

 was at firft filled with common air, and ibme muft enter on 

 conneding the apparatus, which is fufficient to account for the 

 refults. 



FOURTH CLASS. 



Azotic Gas, xinth Mixtures containing Oxigenous Gas, 

 Ajote With 1 . Azotic gas and one y oxygenous : after ftanding three 



pounds.°"^ "'"' ^^"""^ ^^^ upper phial was of the ftandard 1.78, or about 

 ^ oxygenous. 



2. Azotic gas with atmofpheric air; after ftanding three 

 hours : the upper phial was not lenfibly dimjniftied by nitrous 

 gas ; the under phial, however, had loft two per cent, or -^ 

 of its oxigen. The reafon of this was, that the azotic gas in 

 this experiment having been juft made for it from nitrous gas, 

 this laft had not been completely faturaled with atmofpheric 

 air, and hence had feized upon all the oxygen afcending into 

 the upper phial. 



Having now related all the experiments I made of any 

 importance to the fubjed, it will be proper to add, for the 

 fake of thofe that may wifli to repeat fome of them, that great 

 care muft be taken to keep the infide of the tube dry ; for if a 

 drop of water interpofe between the two gafes, I have found 

 that it effedually prevents the intercourfe : glafs tubes Ihould 

 therefore be ufed, that one may be fatisfied on this head;, as 

 the obftruftion will then be vifible. 



J fliall make no further comments on Ihe above experimentSj, 

 by way of explanation ; becaufe to ihofe who underftand ray 

 bypothefis of eiaftic Ihiids, they need none ; and I think it 

 Vi'ould be in vain to attempt an explanation u^iy other way. 



lean 



