&fy Mr. Davy's Lecture on some new analytical Researches 
My results have been very different, and the reasons will, 
I trust, be immediately obvious. 
When the retort containing the fusible substance is ex- 
hausted, filled with hydrogene and exhausted a second time, 
and heat gradually applied, the substance soon fuses, effer- 
vesces, and, as the heat increases, gives off a considerable 
quantity of elastic fluid, and becomes at length, when the tem- 
perature approaches nearly to dull redness, a dark gray solid, 
which, by a continuance of this degree of heat, does not un- 
dergo any alteration. 
In an experiment, in which eight grains of potassium had 
absorbed sixteen cubical inches of well dried ammonia in a 
glass retort, the fusible substance gave off twelve cubical 
inches and half of gas, by being heated nearly to redness, and 
this gas analysed, was found to consist of three quarters of a 
cubical inch of ammonia, and the remainder of elastic fluids, 
which when mixed with oxygene gas in the proportion of 
to 6, and acted upon by the electric spark diminished to 5-. 
The temperature of the atmosphere, in this process, was 57 0 
Fahrenheit, and the pressure equalled that of 30.1 inches of 
mercury. 
In a similar experiment, in which the platina tray contain- 
ing the fusible substance was heated in a polished iron tube, 
filled with hydrogene gas, and connected with a pneumatic 
apparatus containing very dry mercury, the quantity of elastic 
fluid given off all the corrections being made, equalled thir- 
teen cubical inches and three quarters, and of these a cubical 
inch was ammonia ; and the residual gas, and the gas intro- 
duced into the tube being accounted for, it appeared that 
the elastic fluid generated, destructible by detonation with 
