MATERIA MEDICA AND THERAPEUTICS. 239 



Externally, it is a very useful agent in various skin diseases, 

 both parasitic and non-parasitic ; for this the official ointment may 

 be used or if used on a large surface on dogs it should be diluted 

 With an equal amount of zinc ointment. 



Equal parts of tar ointment and sulphur ointment make an 

 efficient application in various skin ailments. 



If a lotion is desired ; tar, glycerin, green soap, each two 

 ounces, alcohol eight ounces. 



Tar is used to stimulate the growth of horn, but a mild ( 1 to 

 12) ointment of cantharides applied to the coronet every day is 

 superior. 



In skin diseases, especially of dogs, the writer prefers oil 

 of cade. 



ESCHAROTICS. 



This includes the mineral acids, caustic potash, chloride and 

 sulphate of zinc, arsenous acid, corrosive sublimate, etc., which 

 have been studied under their proper heads ; also 



ACIDUM CHROMICUM— CHROMIC ACID. 



Occurs in deep red, needle-formed crystals, very soluble in 

 water, forming an orange red solution. Explosive when mixed 

 with glvcerin, spirit of nitrous ether, alcohol, etc. Use water only. 



Actions. — Is an oxidizing caustic', slow in action and not 

 very painful, but penetrates deeply and is very destructive ; on 

 account of it penetrating so deeply it should be used with great 

 care. Mice or birds soaked in it will entirely disappear; it also 

 destroys bone; always protect the surrounding tissues with oil 

 or vaseline. 



Uses. — Used entirely to destroy growths, as warts, tumors, 

 etc. Sometimes used in weak solution to touch up indolent 

 ulcers ; can be made into a paste with water. Sloughing occurs 

 in 24 to 48 hours. Is caustic in from 5 to 20 per-cent solution. 



A I per cent solution is used as a remedy in viper-bites. 



