gfi O/i ike Purity of Drugs and Medicines , 



of iron, and fometimes a confiderable quantity of lime. In order to difcover the prefence of 

 iron, a little of the fait is to be faturated with acetic acid, a few drops of pruffiate of pot-afli 

 is then to be added, which will impart to the folution a blue tinge if the minuteft quantity 

 of iron be prefent. The prefence of calcareous earth is manifefted by means of oxalic acid, 

 occafioning a white precipitate of carbonate of ammoniac; that containing the leaft quantity 

 of iron has a yellowifli tinge, whereas pure carbonate of ammoniac is of a fnow whitenefs, 

 perfedly dry, fomewhat fonorous, volatile before 212° Fahr. and foluble in 2 parts of diftil- 

 led water at 55° Fahr. Its fpecific gravity is generally 1,4076, and its component parts are 

 40 ammoniac, 53 carbonic acid, and 7 water. 



Salt of Hart/horn, Ph. L. Carhnate f Ammoniac foiled with Animal Oil. 



The genulnenefs of this article (which differs from the former, merely, in being impreg- 

 nated with a fmall quantity of animal oil) may be difcovered in a fimilar manner. 



Solution of the above in an Aqueous Fluid. Volatile Liquor of Hartfhorn. Ph. L, 



Is in general imitated by mixing a quantity of aqua ammoniac purae with the officinal 

 fpirit of hartfhorn, in order to make it ftronger, and to give it the appearance of a fpirit well 

 faturated with volatile fait. The fpirit thus becomes more pungent, fo as to bear an addition 

 of a confiderable portion of water, without betraying the impofition either by thetafte or fmell. 

 This fraud may be difcovered by adding ftrong ardent fpirit to the fophlfticated fpirit ; for 

 if no confiderable quantity of cryflallized volatile fait becomes precipitated, the adulteration 

 may be fufpefted. It may even be difcovered by the circumftance of the fpirit not effer- 

 vefcing brilkly with acids. 



Spirit of hartdiorn carefully diftilled is colourlefs. Its tafte is not very unpleafant (faline 

 not pungent), and its fmell fomewhat empyreumatic. By long keeping it contrafls a 

 yellowifh tinge, and acquires a bitter tafte and naufeous foetid fmell. If fully impregnated 

 with volatile alkali, its fpecific gravity is about 1,500. 



IX. 



A Memoir on the Ammoniuret of Cobalt, and upon a new Acid contained in the Grey Oxide 

 of that Metal, known by the N^me of Zaffre. By Louis Br vgnatelli*. 



M 



Y attention has been, for fome time direded to the ammoniacal combinations of the 

 metals, or the ammoniurets. They have hitherto been little examined, excepting that of 

 copper, though their cRara£teriftic properties diftlnguifh them very prominently from othor 



* Tranflated from tlie Italian manufcript of the author, by Van Mons, into French in the annals <Je. 

 Chemie XXXIII, 114, whence the prefent tranflation is made. 



botlies. 



