856 BOVINE PATHOLOGY, 



is a peculiar crackling beneath the epidermis when pressure 

 is brought to bear upon the part. The gas is at liberty to 

 escape if incisions or punctures are made through the skin ; 

 in addition, the surface should be manipulated freely. 

 Sometimes the patient will require a stimulant dose. 



Bloody Sweat, as occurring in oxen, has been dealt 

 with by Count Ercolani, the celebrated Italian veterinary 

 professor; his conclusions are given in volume iii of the 

 ' Edinburgh Veterinary Review,^ page 567. 



Peuritus — Neurosis (Law) consists in itchiness of the 

 skin without any appreciable structural change. It is not 

 rare in cattle, and causes a considerable degree of rest- 

 lessness, so that the animal applies friction to the affected 

 part until it becomes raw. Such cases are generally 

 attributable to excessively high feeding and want of exer- 

 cise. They must be treated with saline cathartics and 

 sedative applications. 



. The effects of colour on diseases of the slcin are sometimes 

 marked. White portions of the skin seem to be more 

 liable to disease than those which contain pigment. In cer- 

 tain forms of vegetable poisoning sloughing of only the 

 white portions of the skin is seen, and in cases of some 

 forms of impetigo it has been stated that the white por- 

 tions of the skin especially are involved. There is related 

 a peculiar case, illustrating the effects of colour, in the 

 ' Yeterinarian,"' 1834, p. 97 : — A white cow, with some black 

 spots on various parts of the body, suffered from acute 

 fever, with a peculiar hardness of the skin. Shortly, the 

 cuticle, and with it the hairs, separated from the dermis, 

 except where the skin was black ; the coloured spots re- 

 mained quite soft and healthy. The hair gradually grew 

 again^ except on the shoulders. 



Subsection 2. — Parasitic Disorders of the SJcin. 



Some of these are attributable to Dermatozoa (animal 

 parasites, or Ectozoa), others to Dermatophyta. The former 

 are most important, the latter are acquiring fresh interest 

 as we become more acquainted with the vegetable forms 

 which give rise to disease. 



