ASTRINGENTS. 89 



ZiNCUM — Zinc. 



Chief Preparations. — Zinci Acetas, acetate of 

 zinc. Soft, white, micaceous or pearly, six-sided tab- 

 lets or scales, somewhat efflorescent in dry air, hav- 

 ing a faintly acetous odor, a sharp, metallic taste, and 

 a slightly acid reaction. Soluble in 3 parts of water 

 and in 30 parts of alcohol. Is emploj^ed mostly ex- 

 ternall}^. Dose, same as of the sulphate. 



Zinci Carbonas, carbonate of zinc. A white, im- 

 palpable powder, permanent in air, odorless, tasteless, 

 insoluble in water or alcohol. Dose: H., 3 ij.-iv. ; 

 D., gr. ij.-vi. 



Zinci Chloridum, chloride of zinc. A white, crys- 

 talline powder, or white, opaque pieces, verj^ deli- 

 quescent, having a very caustic, saline, and metallic 

 taste and acid reaction. Soluble in both alcohol and 

 water. It should be kept in small glass-stoppered 

 bottles. It is used externally only. 



Zinci Oxidum, zinc oxide. A soft, pale-yellow- 

 ish, or nearly white powder, permanent in air, odor- 

 less, tasteless, insoluble in water or alcohol. Dose 

 same as of the carbonate. 



Zinci Sulphas, sulphate of zinc, white vitriol. 

 Small, colorless, right rhombic prisms or acicular 

 needles, slowly efflorescing in dry air, having a sharp, 

 saline, nauseous, and metallic taste and acid reac- 

 tion; soluble in 0.6 part of water, insoluble in alco- 

 hol. Dose: H., 3 ss.-ij. ; D., gr. i.-iij. (as an emetic 

 in water, gr. viij.-xv.). 



