738 DISEASES OF THE CUTANEOUS SYSTEM. 



Class II. Diseases of Nutrition, including Netv Formations. 



a. Hypertrophies. 



b. Atrophies. ^^ 



c. New-formation, or heterologous growths. 



Class III. Neuroses. 

 Class IV. Diseases of Accessory Organs and Structures. 



a. Diseases of sudorific glands. 



b. Diseases of sebaceous glands. 



c. Diseases of hairs and hair-follicles. 



Class V. Hmmorrhages. 

 Class VI. Parasitic Diseases. 



a. Animal (dermatozoic). 



b. Vegetable (derviatophytic). 



Of these divisions, the 1st, 2nd, and 6th are well defined, and 

 together with the 4th will be found to constitute, if not the 

 whole, certainly nearly the whole of the skin diseases which in 

 the practice of equine medicine engage our attention. 



CHAPTER LY. 



DETAILED DESCRIPTION OF THE MORE COMMON FORMS OF 

 SKIN DISEASES IN THE HORSE. 



Class I. Congestive and Inflammatory Diseases. 



Under this group of congestive and inflammatory action in its 

 many variations which mark these vascular disturbances, we 

 find a large proportion of the skin diseases of our patients. We 

 observe that the pure hypersBmia and congestion in erythema 

 may, by effusion into the dermal textures, pass on to the form 

 of plastic or papular inflammation; by exudation into the 

 catarrhal, or developing the higher grade of action, pustulation 

 may occur ; while, as the result of these, we may have the 

 various forms of the scaly. All these manifestations of the 

 inflammatory process may be looked at, as they meet us in 

 daily practice — (1) as acute, and (2) as chronic; these being 

 further subdivided into idiopathic and symptomatic. Under 



