^HARMACEUTJCAt PR EPAR ATIO]?f S. 1 3 j[ 



afteded. It fucceeds very well, when the operator is endued 



with patience, and works in a cold place. It may be abridged The procefs may 



however, if, accordinff to the excellent advice of Baume, we ^^ ^°^}^''^<^ by 

 ° employing coa- 



eraploy coagulated oil of olives, by which the furfaces of con- gulated oil. 



ta6l are increafed, and (he introdu6tion of the air is facilitated. 

 One important fa6l with refped to keeping the preparation is. Warmth fpolls 

 that at the temperature of 15° or 16°, at which moft kinds"* 

 of fermentation take place, a portion of the carbonic acid is 

 extricated, and leaves expofed an oxide at -j-^-^, which becomes 

 again yellow. It requires a temperature of 10° to pr^ferve But it will keep 

 its white colour unaltered. "^"^^ '" ^^^ "•^• 



Citizen Dubree, and Citizen Granet before him, propofedThe addition of 

 to expedite the preparation by adding hog's lard; but I find, jufjous? 

 that this addition diminifhes its bulk and levity. In Germany Different com- 

 different corapofitions are made under the name of nutritum, ^^^^i^^^^\^^ 

 as with vinegar of litharge and half its weight of oil of rofes, Germany. 

 which produce an ointment as white as wax, and of the con- 

 fidence of a liniment; with vinegar of litharge two parts, and 

 olive oil three parts, which yield a whitith ointment of a mo- . 

 derate confidence; with two parts of olive oil, one part of 

 wax, and two parts of vinegar of litharge, which furnifh an 

 dintment of a firm confidence, and a waxy whitenefs. But all All thefe fimply 

 thefe compofitions are fimple mixtures, feebly united, by no "^'"""* 

 means refembling the nutritum of the French fliops, and not 

 requiring for their formation a mutual readion between the dif- 

 ferent particles of the ingredients. 



Cryfiallization of Phofphoric Acid. 



It is known, that the affinity of phofphoric acid for water Phofphoric acJd 

 overpowers its force of cryftallization; in faft this falifiant fub- '^°?^j"""'>' *. 

 fiance appears commonly in the form of a thick oil. I have yetcryftalli'^- 

 lately obferved, however, that time, the grand producer of ^^^^ ^^ '''"^» 

 regular cryftalli2;ations, effeds a fymmetrical combination dq-^ 

 tween its particles. 



I had prepared halfa kilogramme of phofphoricacid, accord- 

 ing to the method of Lavoifier, with phofphorus and nitric 

 at:id, both of them extremely pure. This acid, freed from 

 nitrous gas, reduced to the confidence of a thick fyrup, and 

 introduced into a phial with a glafs dopper, had been ufed at 

 different times in the courfe of a year, without exhibiting any 

 peculiar appearance. The year following I let it remain per- Cryftals (ormti 

 K2 fg^]^, in it by repofs. 



