TOPICAL AGENTS. ' 197 



occurs in from two to six hours, and later these vesi- 

 cles rupture and coalesce. If pure mustard has been 

 used pustules may form, causing a sloughing of the 

 skin and destruction of the hair roots. Mustard acts 

 more promptly than cantharides, but its effects are 

 not so permanent. It is the most suitable blister for 

 cattle, but should not be used full strength for the dog 

 or sheep. Mustard is used in catarrh, sore throat, 

 laryngitis and pharyngitis, bronchitis, pneumonia, 

 pleuris}', indigestion, colic, chronic rheumatic affec- 

 tions of the joints in cattle. In parturient apoplexy 

 in the cow, sometimes applied over the kidneys to 

 promote diuresis b}^ counter-irritation. Its effects 

 ma}' be increased by adding a small amount of tur- 

 pentine. The volatile oil of mustard is sometimes 

 used to sharpen liniments, but must be cautiously 

 used, not only on account of its great activity, but 

 also because of its toxic properties. 



Pulvis Siuapis Seminis, pov^'dered mustard seed. 

 Dose: H. and C, 3 ij.-vi. ; D., gr. x.-xx. ; as an 

 emetic, gr. xxx,- 3 i., in warm water. 



Fix Liquida and Oleum Picis Liquidce. See 

 under Turpentines, etc. 



Campliora. See under Camphor. 



Terehintliina. See under Turpentine. 



Capsicum. See under Capsicum. 



Cantharis, cantharides, Spanish fly. The dried 

 insect, Cantharis vesicatoria, foimd in southern Eu- 

 rope. The insect has a predilection for lilac, ash, 

 elder, honeysuckle, and rose bushes. It is gathered 

 during the months of May and June, being destroyed 



