SKIN AND MUCOUS MEMBRANES 155 



relaxed granulations, canker of the frog and carcinoma in the form 

 of caustic paste or pencils. 



7. Hydrargyri chloridum corrosivum. Corrosive sublimate. 

 The strongest metallic caustic; used in the form of crystals, powder, 

 paste (1 : 1-5 flour), salve (1 : 1-10), solution (1 : 3-10 alcohol or 

 collodion), bougies or caustic ligature. Hydrargyri iodidum ru- 

 brum has the same action. 



8. Chromii trioxidum. [Formerly official in U. S. as chromic 

 acid.] A powerful, painful caustic for canker of the frog, car- 

 cinoma and other neoplasms in solution, salve, paste (1 : 1-5) and 

 bougies; superior alterative action in scratches of long standing 

 (10 per cent, solution in water). A specific in snake bites. 



9. Arseni trioxidum. Arsenic. An old caustic in breast boils, 

 shoe boils, canker of the frog, carcinoma, quittor, etc., in the form 

 of sticks, paste, salve and solution. 



10. Argenti nitras. Silver nitrate. A mild, superficial caustic 

 (escharotic) for granulations, fistulse and ulcers, chromic conjunc- 

 tivitis and very small warts; used in pencil form. 



11. Cupri sulphas. Copper sulphate. A caustic in ophthal- 

 mology; used for granular and pannus growths on the conjunctiva, 

 also employed in fistulse and ulcers. *Cuprum aluminatimi has the 

 same action and uses (copper pencil). 



12. Fern sulphas. Iron sulphate. A mild caustic for ulcers 

 and fistulse, canker of the frog, the foot lesions in foot-and-mouth 

 disease and chronic affections of mucous membranes. Used in 

 powder or in concentrated solution. 



13. Plumbi acetas. Lead acetate. A mild caustic for canker 

 of the frog. Plumbi nitras has a similar action. 



14. Fern chloridum. Iron chloride. A caustic for canker of 

 the frog and relaxed granulations. A specific against the virus of 

 rabies and snake bites. 



15. Hydrargyri oxidum flavum. Yellow oxide of mercury. A 

 mild caustic for wounds and ulcers (1 : 10) ; also used as a caustic 

 in ophthalmology (1 : 15-25). 



16. Potassii permanganas. Potassium permanganate. A spe- 

 cific caustic for snake bites. 



