430 



BENIGN TUMOURS. 



horse are due to the presence of pus too deeply seated to find 

 its way to the surface. 



These old abscesses may be removed either by excision of 

 the whole mass, or by destruction with caustics. If not very 

 large, perhaps the latter is the quicker method ; but if very 

 large, the knife must have the preference. It is quite useless 

 to attempt their reduction by the use of external stimulants 

 such as iodine or blisters. 



II. — EPIDERMIC AND EPITHELIAL TUMOURS 



Form a class of new formations of much interest, and are of 

 frequent occurrence. Warts (Verrucse) on the skin and on the 

 mucous membranes are instances of them. Warts consist of a 



thickening of the epidermis, pro- 

 duced by accumulation of its scales, 

 with hypertrophy of the papillse of 

 the true skin. 



These growths are found most 

 commonly in young animals, their 

 favourite seat beinsf the under sur- 

 face of the abdomen, the genitals, 

 mammary glands, lips and eyelids. 

 In the dog they are often seen in 

 large numbers within the mouth, 

 appearing in a very short space of 

 time, and disappearing as quickly. 

 "Wlien they form on mucous mem- 

 branes, or when found about the 

 anus, they are called condylomata. 

 They are of the same nature, but 

 are softer in consistence than the 

 wart. 



They may be removed by exci- 



FiG. 100. — Perpendicular section 

 of a papilla, from an acuminated 

 condyloma, after the addition of 

 acetic acid. a. Vascular loop, in- 

 ternal to which is fibrous tissue, 

 forming the axis of the papilla. 

 Outside are nuclei, b. h. Basement 

 membrane, c. c. Epidermic cells. 

 250 diam. — (Wedl.) 



sion or torsion ; twisting or pulling 

 by the hand being very often sufficient. If they are found 

 within the sheath of the penis, or on the prepuce surrounding 

 the orifice of the urethra, the patient has to be cast, and the 

 whole mass of them removed by the cautery or knife, and their 

 seat cauterised. If this be not done, they are apt to grow again. 



