10 



and may be introduced into the retort in small pellets. From 

 an ounce of acetate of Kali and the same quantity of sul- 

 phat of Iron and of sulphat of Kali, were obtained grs. 348 

 of acetic acid, spec, gravity grs. 1040, by distillation with a 

 lamp heat. 



TARTAR OF IRON. 



Tartar dissolves the oxyd of Iron, and forms with it a triple 

 salt as with the oxyd of Antimony. Precipitated carbonate 

 of Iron was found to answer best; when boiled with Tartar 

 and water in the proportion of the Dublin Pharmacopoeia, 

 the salt is obtained in a mass of concreted spicular crystals 

 of an olive colour. This attracts humidity from the air. Its 

 flavour is rather sweetish than sour; the solution however de- 

 stroys the colour of Litmus. 



TINCTURA MURIATIS FERRI. 



Having prepared this tincture in the proportions of the 

 London Pharmacopoeia, with precipitated carbonate of 

 Iron, I found, that in some instances, when rectified spirit 

 was mixed with the evaporated muriate, crystals of green 

 muriate of Iron deposited, which the spirit did not dissolve. 

 The strength of the tincture Avas consequently variable. Tliis 

 observation suggested the process of Tinctura muriatis ferri 

 cum oxydo rubro, which is now inserted amongst the Praep. 

 Extemp. of the Dublin Pharmacopoeia. The muriatic solu- 

 tion 



