210 THE MANAGEMENT AND DISEASES OF THE DOG. 



it regains its normal vitality and thickness. During the first 

 twp or three days a new crust forms ; but this has not the 

 sulphur-yellow color of the primary crust, and if examined 

 with the microscope, there are no longer to be found traces of 

 the parasite, but only numerous epithelial elements. Finally 

 this kind of crust falls off, leaving the skin hairless, but every- 

 where level, smooth, and supple. Then the hair begins to 

 grow, and in a variable period — generally about three months 

 — it is difficult to discover the part that has been affected. 



" An ointment composed of one part nitrate of silver to 

 loo parts of lard, has also been successfully employed. 



" Mercurial ointment, tar ointment, and sulphate of mer- 

 cury ointment, have also been beneficially used. In some 

 cases, it may be necessary to remove the hair."* 



WARTS. 



The dog, though not perhaps so frequently as the horse, is 

 nevertheless very subject to warts. The eyelids, ears, mouth, 

 and lips are the situations most favorable to their growth ; 

 not unfrequently they are seen on the penis. 



" A wart is a state of hypertrophy of the papillae of the 

 derma, attended with an increased production of epidermis. 

 Warts are usually of small size, and of a rounded figure, 

 verruca simplex ; sometimes, however, they appear in the form 

 of bands several lines in breadth, and of variable length. 

 They are generally insensible, rough to the touch, and their 

 medium projection from the surface is about a line." 



" When warts have grown to some length, their extremity 

 becomes rough, and their fibrous structure is distinctly ap- 

 parent ; it not unfrequently happens that warts of long stand- 

 ing split and break up in the direction of these vertical 

 fibres, verrucn lobosa." 



* Fleming's " Veterinary Sanitary Science," vol. ii. pp. 480, 481. 



