THE ORGANS OF SPECIAL SENSE. 225 



the ravages of the disease to which he supposed they give 

 rise. Their surgical removal is recommended by Hill, 

 who, like Youatt, quotes the paper from the ' Veterinarian/ 

 in extenso. 



THE SKIN. 



The study of skin diseases in the dog has long remained 

 empirical even to a greater degree than other branches of 

 canine pathology. Blaine first, in this country, threw a 

 little light on the subject in describing " Mange " as of 

 five forms, the scabby, the red, ulceration of the sebaceous 

 glands, surfeit, and acute erysipelatous mange. When he 

 wrote, the influence of animal parasites in the genesis of 

 skin diseases was just beginning to be recognised. 

 Touatt also mentions this latter influence, but, as usual, 

 closely follows Blaine's description of the disease, while 

 differing from him as regards treatment. Mayhew dis- 

 tinguishes between parasitic mange and four other forms, 

 of the pathology of which he was not well assured 

 although acquainted with them practically. J. A. Nunn, 

 in the "' Veterinary Journal,' vol. vi, published an excellent 

 practical article on the skin diseases of the dog (which he 

 had prepared some time before), in which scabies, follicular 

 mange, eczema rubrum, and the diseases due to vegetable 

 parasites, are differentially diagnosed. W. Hunting has 

 dealt with several skin diseases of dogs in an excellent 

 manner, his article on follicular scabies in the ' Veterinary 

 Journal ' having brought that disease prominently before 

 the notice' of the profession in England. Fleming deals 

 with the parasitic affections of the skin in his f Veterinary 

 Sanitary Science and Police.' Extraordinary ideas have 

 been held as to the anatomy of the skin of the dog; 

 certainly this animal does not perspire so freely as most 

 other animals, but he does perspire perceptibly under 

 extreme exertion, and some of the emergencies of disease 

 and histology has shown that sudoriparous glands exist. 

 They open into the hair-follicle above the sebaceous glands, 

 but at some distance from the epidermis. The erector 

 pili consists of elastic fibres and white muscle-cells running 



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