ANODYNES. 537 



of the living tissues, and thus destroy or arrest the activity of 

 organic poisons, as in bites, dissection wounds, syphilis, malig- 

 nant disease, and gangrenous processes. They include : 

 Caustic Alkalies, Mineral Acids, Solution of Chloride of Anti- 

 mony, Chloride of Zinc, Nitrate of Silver, Sulphate of Copper, 

 Arsenic, Acid Nitrate of Mercury, and Dried Alum. 



8. Vesicants are applied to chronic ulcerating surfaces to 

 stimulate the circulation in the surrounding parts, and soften 

 callous edges. Cantharides is chiefly used. 



9. Anodynes are intended to alleviate the pain of wounda 

 and ulcers, and induce sleep. The medicinal anodynes com- 

 monly thus applied are preparations of Opium and Belladonna. 



