170 INORGANIC AGENTS 



is a good purgative preparation for occasional use. Two or three pills 

 for large dogs ; one to two pills for small animals. 



Hydrargyri lodidum Rubrum. 



The red mercuric iodide is a favorite remedy in veterinary practice. 

 It causes absorption of morbid exudations through its counter-irritant, 

 local absorbent and alterative effect, in combining the action of iodine and 

 mercury. It is employed with 8 to 10 or 12 parts of lard or vaseline, and 

 is of value in the treatment of periostitis with osseous deposits, especially 

 for splints. Spavin and ringbone are treated with red iodide of mercury 

 alone, but are generally cured more effectively by rest, firing, and blister- 

 ing. The red iodide of mercury ointment is also of use for enlarged 

 glands, chronic swelling about tendons, joints or bursae; and applied 

 about the throat in chronic laryngitis and "roaring." The ointment is 

 rubbed on splints every third day, or until vesication is produced, and the 

 hair begins to drop out, when its use is stopped for a time. It is useful 

 in chronic rheumatic joints and in induration of the udder in bovines. 

 Like other mercury preparations, the red iodide must not be employed in 

 large quantities over an extensive surface. It is much more irritant 

 locally than blue ointment. 



Hydrargyri iodidi rubri oi. 



Adipis Si- to giss. 



M. 



Sig. Apply externally. Stronger ointment for 

 spavin, ringbone, splints; weaker for tendons, 

 joints, bursae, glands, throat. 



Unguentum hydrargyri nitratis, or citrine ointment, is similar to un- 

 guentum hydrargyri ammoniati (white precipitate ointment), but more 

 powerful, and should be diluted with equal parts of lard. These oint- 

 ments are used for their stimulant action in granular lids, chronic eczema, 

 pityriasis, and for their anti-parasitic effect in ring-worm. 



SECTION VII. 

 ARSENUM. 



Arsenic is not used in ihe metallic state as medicine. 



Arsesti Trioxidum. Arsenic Trioxide. As^Oj. (U. S. P.) 

 Synonym. — Acidum arseniosum, B. P.; acidum arsenicosum, P. G. ; arsenous 

 acid, white arsenic, arsenicum album, arsenic, arsenious anhyrid, E. ; acid ars6- 

 nieux, arsenic blanc. Fr. ; arsenicsaure, weisser arsenic, G. 



Derivation. — Arsenical ores are roasted and purified by sublimation. 

 Properties. — Occurs either as an opaque, white powder, or in irregular 

 masses of two varieties; one amorphous, transparent and colorless, like glass; 

 the other crystalline, opaque, and white, resembling porcelain. Both are odorless 

 and tasteless. Arsenic trioxide is soluble in water, the amorphous somewhat 

 more so than the crystalline variety. Arsenic trioxide is slightly soluble in 

 alcohol, but freely soluble in glycerin, and is dissolved by hydrochloric acid and 

 alkaline solutions. Frequently the same piece has an opaque, white, outer crust 

 enclosing the glassy variety. Contact with moist air gradually changes the glassy 

 into the white, opaque variety. Faintly acid reaction in solution. When covered 



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