(jbi the conJHinent Paris o/Azoh §4^ 



Was made to pafs. When no more fleam was tranfmittedj 

 the difengagement of the azot ceafed ; but it recommenced 

 as foon as the \vater was again boiled, and new ftcam began 

 to pafs over the manganefei This experiment was repeated 

 fix days fucceflively, each day foi" three hours, and always 

 with the fame fuccefs. Wheii the operation was endedj the 

 manganefe was found cemented to the porcelain tube in fuch 

 a manner that it could not be feparated. 



6. Dr. Pearfon analyfing water by an eleftrlc fpark, al- 

 "v^^ays obtained azotic gas, befides the twd gafes of which 

 water is compofed. 



7. The fame gentleman burning, in a tube hermetically 

 fealed, a mixture of oxygen and hydrogen gas by means of 

 an eleftric fpark, obtained water and azotic gas. 



8. Dr. Prieftley obferved, that oxygen gas which had re- 

 mained in coritacS; for fome time with the pureft diftilled 

 water was in part changed into azotic gas. I have proved 

 tuis obfervatidn, and I found 0.1 of azotic gas in the oxygen 



9. A mixture of hydrogen gas and nitrous gas, \vhich re- 

 mains for fome time in contact with water, no longer burnSj 

 and is found changed into atmofpheric air; which I explain 

 by fuppofing that the hydrogen combines itfelf with a part 

 of the oxygen of the nitrous gas, or of the water, and is con- 

 verted into azotic gas. This experiment, which was made 

 by Mr. Link, with me did not fucceed. 



10. Dr. Prieftley found that hydrogen gas, which he had 

 kept for a long time in contaft with water, was entirely 

 cKanged into azotic gas*. This experiment does not aU 

 ways fucceed; It fucceeded four times with Prieftley; It 

 is, ^10 doubt, neceffary that the water fliould contain oxygen* 



11. in burning a mixture of eleven cubic inches of hy« 

 drogen gas and one inch of oxygen gas, azotic gas Is ob* 

 tained. This experiment was made by M.' Yelin, but with 

 hie did not fucceed. 



12. When the fteam df \<^ater is tnade to pafs through si 

 gun-barrel which has been before employed feveral times fof 

 the fame kind of experiments, and has been entirely oxydat«a 



* See Pruftley's woik befor* (juotcd, Vol. L p. ajo; 



m 



