304 VIII. ACIDS.— Nitrous. 



large stone-ware jars, or aludels, placed one on the other, to the 

 number of seven or eight. As the residuum must be drawn out 

 while yet soft, there is only produced 1,920, or 2, I60lb. of weak 

 acid, at 21 deg. Baume: being about 2-3ds of the acid in the 

 salt : the acid is yellow, and pleasanter to the taste than that dis- 

 tilled in iron. 



Weber's marine acid. Bittern, or residuum of sea- water after 

 the common salt has been obtained by evaporation, 51b., oil of 

 vitriol lib., previously diluted with water 2lb. ; distil. 



Acidum muriaticum dilutum^ P. D. Spirit of salt, spec. grav. 

 1*170, distilled water, ana p. aeq. ; mix : the specific gravity should 

 be 1*080. Muriatic acid is tonic, antiseptic, gtt. x — xx, well 

 diluted in typhus, 3ss — 3ij in water 5vj as a gargle in putrid sore 

 throat, gtt. viij in water Siv as an injection in gonorrhoea. Used 

 in the arts as a cheap acid : a small portion improves salted pro- 

 visions : also as a test for silver, borax, ammonia. 



Spirit of nitre with bole, Spiritus nitri. Nitre lib., 

 clay 41b., moisten, make into balls, and distil. 



Aqua fortis, A. f. simplex. Copperas 2lb., white rough petre 

 lib., mix and distil. 



2. Spirit of nitre 20lb., oil of vitriol 71b., water oOlb. ; mix. 

 Said (Elab. laid open) to be nearly the standard of the aqua fortis 

 imported from Holland for the dyers. 



Doidfle aquafortis, A. f. dupdex. White petre, copperas, of each 

 61b., copperas calcined to redness 31b., distil. 



% Spirit of nitre 91b., oil of vitriol lib.; mix: used by en- 

 gravers and brass founders to clean their work. 



Strong aquafortis, Eau forte. Stark wasser. Copperas calcined 

 to whiteness, white petre, of each 301b., mix and distil in an iron 

 pot with a stone-ware head : very red, smoking, has sometimes an 

 oil floating upon it. 



Julin's aqua fortis. Rough nitre, and calcined Fahlun aqua 

 fortis vitriol No. o, of each 4lb., distil ; a white inflammable sub- 

 stance comes over with the acid, the nature of which is unknown. 

 Boerhaave's spiritus nitri Glauber i. Nitre 31b., oil of vitriol lib. ; 

 distil : gold colour, deep red vapour, scarcely confinable. 



Geoffroi/s spirit of nitre, Nitrous acid, Spiritus nitri fumaiis, 

 Acidum nitrosum, A. nitroso-yiitriticum. Nitre 60 oz., oil of vitriol 

 30 oz; distil into a large receiver without water; yields about 

 SO oz. : red, and very smoking, sp. gr. 1*53. 



% Nitre 24 oz., oil of vitriol 12 oz., distil into a receiver con- 

 nected at top with two bottles, the first containing water li oz., 

 the second 6 oz. The receiver contains a concentrated acid, sp. 



