372 AFFINITIES OF COMPRESSED GASES, 



Experiment V. 



Exp. 5. Repc- Having now the fpring-valve, and new receiver of five 



^ n ^ r xp ' I# cubic inches and a half capacity*, I poured in two fcruples 



paratus. of folution of potafh, and then injected two pints of hidrogen, 



two of nitrogen, and three of oxigen. This quantity was 



hardly fufficient for the capacity of the receiver, and the re- 



fult was only a fmell of the gafeous oxide of nitrogen, a few 



yellowifh fumes, and fcarce enough acidity to tinge the edge 



of the left paper : of courfe, I could not effecl the formation 



of nitrate of pota(h. 



Experiment VI. 



Exp. 6. Nitro- I now determined to begin with the nitrogen, which al- 



gen (firft) and wa « s appeared to me to undergo the moft important chemical 



then hidrogen . r .,,... rt , . J . 



and oxigen. changes, and therefore injected two pints of nitrogen, three 



of oxigen, and two of hidrogen. Upon the condenfation of 

 the nitrogen, it fpeedily aiTumed an orange-red colour, which 

 upon the acceffion of the oxigen, gradually diminilliecl, and 

 at length difappeared, though at firft it feemed rather deeper. 

 A moid vapour, coating the infide of the receiver, arofe upon 

 the compreffion of the hydrogen, which moifture was ftrongly 

 acid to the tafte, coloured litmus, and, when very much di- 

 luted with water, acled upon filver. 



Experiment. VII. 



Exp. 7. The Nearly the fame as the laft, but with different arrangement. 



fame, but diffe- -j;\fc nitrogen, three pints and a half, was firft introduced; 

 rent arrange- , • . . . , Jt . 



menu ^" e ^ tne oxigen, two pints ; and next the oxigen, three and 



a half. The nitrogen formed the orange-red colour as before ; 

 the hidrogen produced white clouds at firft (quare ammonia ?) 

 which afterwards difappeared, and the orange-red colour be- 

 came lighter; but upon the afTufion of the oxigen, the colour 

 did not difappear as in the laft experiment, but, if any thing, 

 became darker. I then injecled two pints more cf hidrogen, 

 but this had little or no effect upon the colour. Some vapour 

 was generated, which was, as ufual, ftrongly acid. 



Experiment VIII. 

 Exp. 8. Nitro- Previous to the burfting of the fmall receiver, I had put in 

 gen over lime- it a fcruple of lime, and condenfed upon it three pints o 

 wattr. 



* One fifth part of a pint very nearly .-^N. 



nitrogen. 



