CADMIUM. 71 



is possible that the metal exerts a second or remote astringent 

 effect on these parts as it is leaving the system ; for the sul- 

 phate and oxide appear to have the power of arresting chronic 

 discharges from remote mucous passages, such as the uterus and 

 vagina, even when given internally ; and it is certain that the 

 oxide diminishes the perspirations of phthisis in some instances. 



5. ACTIONS AND USES OF THE DIFFERENT SALTS OF ZINC. 



These have heen sufficiently indicated in the preceding 

 description. The Chloride stands alone as a powerful escharotic, 

 never to be given internally ; it possesses also disinfectant pro- 

 perties, as the Liquor Zinci Chloridi, which is used to mop out 

 very foul wounds, and very extensively to wash infected rooms, 

 flush drains, etc. The Sulphate and Acetate closely resemble 

 each other in their action, but the acetate is little used. The 

 Oxide and Carbonate are similarly allied to each other, the 

 former being generally employed. Zinci Valerianas probably 

 acts as a zinc salt only, the valerianic acid appearing to be 

 inert. See Valeriance Radix. 



CADMIUM. CADMIUM. Cd. 112. 



Cadniii lodidtim. Iodide of Cadmium. CdI 2 . 



Source. Made by direct combination of Iodine and Cad- 

 mium in the presence of Water. 



Characters. Flat white micaceous crystals, of a pearly 

 lustre. Solubility, 1 in 1^ of water. 



Impurity. Zinc, and general impurities. 



Preparation. 

 Unguentum Cadmii lodidi. 1 in 8. 



ACTION AND USES. 



Cadmium closely resembles zinc in its action, both locally 

 and specifically, but is even more irritant, and is not given 

 internally. The iodide, in the form of the ointment or in 

 aqueous solution, is applied as a local stimulant to enlarged 

 joints and glands, to promote absorption, instead of the iodide 

 of lead which stains the skin yellow. 



CERIUM. Ce. 92. 



Only one salt of this metal is officinal. 



Cerii Oxalas. Oxalate of Cerium. CeC 3 4 3H 2 0. 



