ANALYSIS 0,F AMMONIA. J,^| 



gray substance described in page 50 of tins Volume*, are 

 sotnetiiiies carried over undecom pounded in the operation-. 



In some late experiments, I substituted for Ihe iron tube Copper tii'^e 

 a tube of copper, which had been bored from a solid piece, eniploye<i. 

 and the sides of which were nearly a quarter of an inch iu 

 thickness. My object in using this tube was not only to 

 prevent the heat from being too rapidly communicated to 

 the fusible substance, but likewise to be secure, that no me- 

 tallic oxide was present, for though the iron tubes had been 

 carefully cleaned, yet still it was possible that some oxide, 

 which could not be separated fvom the welded parts, might 

 exist, which of course would occasion .the disappearance of 

 a certain quantity of potassiun). 



1 shall give the results of one of the processes, which I Experiiaeat, 

 regard as most correct, made in the tube of copper, "ihe 

 barometer was at 30'5; thermometer was at 59" Fahrenheit. 



The tube contained two cubical inches and half, and was 

 filled with hidrogen. 



6 grains of potassium, which had absorbed J3 cubical 

 inches of ammonia in a copper tray were employed. 



The adaptors connected with the mercurial apparatus 

 and the stop-cocks, contained '7 of atmosphetical air. 



The gas given off was collected in two portions. 



The first portion was equal to 1 1 cubical inches. It con- ist gas, 

 tained '8 of ammonia, 11 of the residuum, detonated with 

 8 of oxigen, left 8. 



The second portion equalled 2 cubical inches. They 2d. 

 contained no ammonia. 10 of this gas, with 8 of oxigen, 

 detonated, left a residuum, of 10. 



There remained in the tube and adaptors 1*1 cubical 

 inch of gas. 



The quantity of hidrogen produced by the action of the Hidrogea. 

 px)tassium, which had been regenerated, equalled 4'5 cubi- 

 cal inches. 



In this experiment the heat was applied much more The heat lo^ 

 slowly than in any of those in which the iron tube was used, 

 and even at the end of the operation, the temperature was 

 little more than that of cherry red. 



♦Journal, vol. XXUI, p. 250. 



u 



