82 
GEORGE MtJLLER. 
In cattle there occurs: 
1. Dermatocoptes itch. This begins at the side of the neck 
and the root of the tail, and spreads later to the back, breast and 
shoulders. Small nodules appear, accompanied by intense itching, 
and a fluid transudes which soon dries up into greyish-brown, dry 
crusts. The hair falls out and the skin finally becomes thickened, 
leathery and folded. 
2. Dcrmatophagus itch (Steifsraude.) At the root of the 
tail and the ischial fossae, crusting and falling of the hair occurs, 
accompanied with itching. In rare instances the eruption spreads 
into the posterior surface of the legs, back and neck. 
In the sheep there occurs: 
1 . Dermatocoptes itch , the most important form of the mal¬ 
ady in this animal. This is the common sheep itch, which 
appears upon all portions of the body that are covered with wool. 
The itching is very intense. Small yellowish papilles appear 
among the long hair, and soon develop into vesicles and pustules. 
They finally rupture and dry up into yellowish-brown crusts. 
There is also active epithelial desquamation. The wool of the 
affected area loses color and becomes loosened ; but it is retained 
in place long after, from the matting together of the fibres by 
the sticky and hardened lymph. 
Finally, we find extensive bald, thickened and plicated areas 
of skin, with cracks and fissures. 
2. Sarcoptes itch causes a fairly harmless skin eruption. In 
merino sheep it only spreads over the parts of the head not cov¬ 
ered with wool; whilst in sheep whose wool does not contain fat 
(Neapolitan and others), it may gradually spread over the entire 
body. It is usually pruriginous, and leads to the formation -of 
firmly adherent crusts, 0.5-1 cm. thick. 
3. Dermatophagus itch. This “foot itch’ 1 begins on the 
feet (Kotengrind), and may finally involve the entire extremity 
and the scrotum or udder. It is characterized by itching, moder¬ 
ate redness, desquamation of the epidermis and the formation of 
yellowish-white crusts. 
The sarcoptes itch occurs in the goat, and it is said by Wal- 
raff to be easily communicable to man, at first on the head 
