214 Mr. E. Howard on a new fulminating Mercury. 



SECTION IX. 



Before I attempt to investigate the constituent principles of 

 this powder, it will be proper to describe the process and mani- 

 pulations which, from frequent trials, seem to me best calculated 

 to produce it. 



100 grains, or a greater proportional quantity, of quicksilver 

 (not exceeding 500 grains*) are to be dissolved, with heat, in a 

 measured ounce and a half of nitric acid.-f This solution being 

 poured cold upon two measured ounces of alcohol,^ previously 

 introduced into any convenient glass vessel, a moderate heat 

 is to be applied until an effervescence is excited. A white 

 fume then begins to undulate on the surface of the liquor ; and 

 the powder will be gradually precipitated, upon the cessation 

 of action and re-action. The precipitate is to be immediately 

 collected on a filter, well washed with distilled water, and 

 carefully dried in a heat not much exceeding that of a water 

 bath. The immediate edulcoration of the powder is material, 

 because it is liable to the re-action of the nitric acid ; and, whilst 

 any of that acid adheres to it, it is very subject to the influence 

 of light. Let it also be cautiously remembered, that the mer- 

 curial solution is to be poured upon the alcohol. 



I have recommended quicksilver to be used in preference to 

 an oxide, because it seems to answer equally, and is less expen- 



* The reason of this limitation is not on account of any danger attending the pro- 

 cess; but because the quantities of nitric acid and alcohol required for more than 500 

 grains, would excite a degree of heat detrimental to the preparation. 



f Of the specific gravity of about 1,3. 



X Of the specific gravity of about ,849. 



