236 SYNOPSIS OF VETERINARY 



Externally is used as a rubefacient, blister, or as a counter- 

 irritant; blister is formed in from 2 to 10 hours, if repeatedly 

 used may cause sloughing of tissue; cantharides can be used 

 wherever a blister or counter-irritant is required, except in in- 

 flammation of the urinary organs, as it is absorbed and will in- 

 crease the inflammation. 



Don't use cantharides too strong on thin skinned horses, not 

 at all on very weakly patients, and with caution on dogs, and not 

 at all on very young animals, or over very large areas. 



For blistering ointment. 



5 Pulv. canth., 3 ii. to iiss. 



Hydrarg. iod. rubr., 3 ii. to iiss. 



Adipis., 3 i'i- 



M. Sig. — Blister, to be well rubbed in for 10 to 15 minutes. 



The application of a mild ointment of cantharides (1 to 12) 

 daily or every other day to the coronets, greatly stimulate growth 

 of horn. 



Cantharides alone is usually used 1 to 8 to 1 to 4 ; for dogs, 

 1 to 12. Lard or lanolin make the best bases for blisters as they 

 are readily absorbed ; vaseline, wax, etc., allow only of a vety 

 superficial action. 



The tincture.may be applied once or twice daily, full strength, 

 when the exudation of much serum is desired. 



Always clip off the hair close, before applying a blister, rub in 

 for 10 to 20 minutes, tie the horse so he cannot bite it ; leave blis- 

 ter on 48 hours, then wash and grease the parts daily. 



RUBEFACIENTS. 

 SINAPIS— MUSTARD. 



SINAPIS alba — White Mustard. 



SiNAPis nigra — Black Mustard. 



oleum siNAPis volatile — Volatile Oil of Mustard. 



A volatile oil, obtained from black mustard. 



The Mustard flour is the form most used. Coleman's Eng- 

 lish Mustard being the best. 



Actions. — Is irritant or counter-irritant, rubefacient, vesicant 

 or suppurant, according to the manner in which it is used ; it acts 

 much quicker than cantharides, but its action is not so prolonged ; 



