434 SALTS OF THE HEAVY METALS 



Therapeutics. Externally as a stimulant and parasiticide, in 

 chronic eczema, parasitic skin diseases, etc. In eye salve 1 ; 10 — 20. 

 The official ointment is usually too powerful 20 to 30 grains to the 

 ounce is usually sufficient. 



* HYDRARGYRI CYANIDUM 



Cyanide of mercury occurs as colorless, prismatic crj'stals, odor- 

 less but of a bitter metallic taste. Eesembles the bichloride but 

 is less irritant. It does not corrode instruments and is used in 

 surgery as an antiseptic. 



HYDRARGYRI OXIDUM PLAVUM AND HYDRARGYRI 

 OXIDUM RUBRUM 



Synonyms. Yellow Precipitate, Red Precipitate 



Yellow mercuric oxide and red mercuric oxide, yellow and red 

 precipitate respectively occur as insoluble powders. The color de- 

 pends upon the method of preparation. The uses are identical. 

 They are not used internally. 



Preparations. 



* Unguentum Hydrargyri Oxidi Ruhri]lO per cent in wool fat 



Unguentum Hydrargyri Flavi J and white petrolatum. 



Oleodum Hydrargyri 25 per cent, of the yellow variety in oleic 

 acid. 



Therapeutics. Stimulant and ' antiseptic to wounds and 

 bruises. The ointments are very useful in eczema, scratches, 

 and in chronic glandular enlargements for absorbent action ; as an 

 eye salve, diluted with an equal amount of lanolin and petrolatum 

 or 1 :30 — 50, in leucoma, Or other chronic inflammations of the 

 eye. The yellow variety is usually preferred because it is less gritty 

 and makes the better ointment. 



? Unguenti Hydrargyri Oxidi Flavi 3 iv 



Adipis Lanse Hydrosi. 



Petrolati aa 3 ij 



M. Sig. For eczema, granular lids, etc. 



* HYDRARGYRI SUBSULPHAS FLAVAS 



Synonyms. Yellow Mercuric Sulphate, Turpeth Mineral 

 This occurs as a yellow, odorless and tasteless powder. It was 

 formerly used as an emetic but has been replaced by other drugs. 



HYDRARGYRI SALICYLAS 



Synonym. Mercuric Subsalicylate 

 This occurs as a white amorphous powder, odorless, tasteless, in- 

 soluble in water or alcohol but soluble in solutions of sodium chlo- 

 * Unofficial. 



