436 SALTS OF THE HEAVY METALS 



wounds. A solution is sometimes employed to wash out poisoned 

 wounds. It is not used internally. 



OHROMII SULPHAS — CHROMIUM SULPHATE 



Chromium sulphate occurs as dark green scales, soluble in water. 

 It has been recommended in fibrosis of the tissues, such as prostatic 

 hypertrophe, etc., and in some forms of neurasthenia, locomotor 

 ataxia and exophthalmic goiter in man. The results from its use 

 are not conclusive. 



Average dose (human) grs. iv — viij ; 0.25 — 0.5. 



POTASSII DICHROMAS — POTASSIUM BICHROMATE 



Potassium dichromate occurs as large, orange-red, transparent, 

 triclinic prisms or four-sided tabular crystals, odorless, and hav- 

 ing an acidulous, metal taste. It is soluble in about 9 parts of 

 water, insoluble in alcohol. 



Doses. H. gr. iij— x; 0.2—0.6. D. gr. Vxo—V^; 0.006— 

 0.012. 



Therapeutics, Potassium dichromate is rarely used internally, 

 although Quitman recommends it in the treatment of Purpura 

 Hemorrhagica. 



Externally it is used in a saturated solution as a caustic for 

 superficial grovTths. 



Purpura. 



IJ Potassii Dichromatis 3 ij 



Tincturse Ferri Chloridi 5 iv 



Aquse q. s ad. O. j 



M. Ft. Sol. 



Sig. One ounce in water every 4 or 5 hours. 



ALUMINUM 



The only important salt of aluminum is alumen or alum. 



ALUMEN — ALUM 



Alum is ofiicial in two forms: ammonium alum prepared by 

 combining aluminum sulphate with ammonium sulphate; and potas- 

 sium alum, prepared by combining aluminum sulphate with potas- 

 sium sulphate. 



Potassium alum occurs as large, colorless crystals, crystalline 

 fragments or a white powder. It is odorless, has a sweetish and 

 strongly astringent taste, soluble in 1 parts of water, more soluble in 

 boiling water, insoluble in alcohol. 



