33 
GEORGE MULLER. 
tions of caustic potash, pix liquid, carbolized oil, carbolized 
glycerine, chrysarobin, ichthyol, iodoform (Popow), naphthalin 
(Schadrin.) 
In the case of dogs it may be necessary to take into consider¬ 
ation the above mentioned more remote internal causes by using 
purgatives (aloes, calomel or arsenic.) 
I.—Prurigo. 
The affection known by this name is of rare occurrence in 
horses, cattle and dogs, and has been but little studied. It is an 
itchy eruption and is probably dependant upon internal causes. 
There are generally spread over the entire rump isolated, small, 
softer or harder nodules, projecting but little above the normal 
level of the skin, and accompanied by a most intense itching. The 
consequent scouring soon ruptures the papules, and they become 
covered with a blood crust. All further changes of the skin occur 
in consequence of the rubbing and scratching. 
The treatment of this very obstinate, but not incurable derma¬ 
tosis has consisted of the exhibition of laxatives, diuretics, arsenic, 
and the local application of weak solutions of caustic potash, car¬ 
bolic acid, salicylic acid, corrosive sublimate, pix liquida, etc. The 
best results seem to have been attained by care of the skin and 
attention to the digestive organs. 
Several authors have also observed in the horse and cow an 
itching without papulation ; it is to be regarded as a neurotic affec¬ 
tion, analagous to the pruritus cutaneous of man. 
5.—Acne. 
This is an eruption similar to the acne vulgaris of man. Sin¬ 
gle or grouped lentil to bean-sized inflammatory nodules appear 
upon the skin. Each one of them is in connection with one or 
more sebaceous glands, and emits a soft caseous material upon 
pressure. The malady appears in summer-time in the horse and 
the sheep, and may affect any portion of the body. It is especially 
apt to appear on the neck, only occasionally, when the itching 
causes rubbing and scouring, or when the affected portions of 
skin are pressed upon by the harness, the nodules may unite into 
