DISEASES OF THE SKIN AMONG DOMESTICATED ANIMALS. 79 
erate fever, an increased redness and beat of the raucous meur 
brane of the mouth. At the places above mentioned there appear 
lentil to pea-sized nodules, at first singly and then in larger num¬ 
bers. These soon become pustules, and when the pustules burst 
they leave behind roundish, shallow ulcers, with red and shiny 
granulating bases and yellowish-white edges. 
According to Eggeling-Ellenberger, there occurs an inflam¬ 
matory affection of the capillary body with swelling and small- 
celled infiltration. The little nodule thus formed breaks up into 
pus, the papillae are destroyed, the cuticle ruptures and finally we 
have a sore with inflammatory and infiltrated margins. The 
ulcer heals by granulation of the base and new epithelium forma¬ 
tion from the edges. 
The development of the nodules and their transformation 
into pustules and ulcers occurs so rapidly that in most cases the 
mucous membrane appears sown with ulcers four days after the 
commencement of the disease. During the next four days the 
ulcers enlarge and occasionally become confluent; and they slowly 
heal in four to eight days thereafter. 
Very frequently similar lesions occur upon the skin of the 
lips, cheeks, alae nasi and, in exceptional cases, upon more distant 
portions of the body. Then also occur inflammatory swellings of 
neighboring lymphatic glands (especially the submaxillary) and 
usually inflammation of the nasal and conjunctival mucous mem¬ 
brane. 
The malady is benign in its course, and needs no special 
treatment. Of course affected individuals must be isolated. 
b .—Caused by Animal Parasites . 
15. —Scabies. 
There are three varieties of insects which cause in our domes¬ 
ticated animals the affection known as the itch. 
These are: 
1. Sarcojptes , Grabmilben—0.2-0.5 mm. long, and 0.2-0.3 
mm. broad, crab-like creatures with horseshoe-shaped heads, well 
developed curved jaws, whose halves interlock from above down¬ 
wards, short stumpy feet, and tulip-shaped suckers. The male 
