FACE-MITES. 49 
glands of the hair. If purposely introduced from the dog to 
the skin of man, it causes an itching sensation, and soon 
afterwardsasorespotanda scab. As proved by many trials 
it is a very fortunate thing that this parasite 
‘does not readily migrate to man. Fig. 25 
shows a number of the parasites in the hair- 
follicle of a dog. 
REMEDIES.—The disease caused by these 
parasites upon domesticated animals is not 
easily cured, and only in the early stages is 
a cure possible. In this case salves or oint- 
ments made from salicylic acid, or a mixture of 
one part benzine to 4 to 8 parts of soft soap, 
do good service. A strong kerosene-emulsion 
would also, no doubt, be of great value, es- 
modex of the pecially if an extract of pyrethrum is added. 
Cronin hair, An ointment made of half a pound of lard, 2 
Buvecd One ounces of tar, and 4 ounces of sulphur, rubbed 
one in before a fire or in the sun, is very effective, 
if it isallowed to remain on theskinforsome days. Peruvian 
balsam, a salve made of corrosive sublimate (1:100), Creolin 
(2: 100), Lysole, Styrax (1: 30 oil), a salve made of canthar- 
ides (1: 6 fat) are also recommended. Several other washes 
are frequently used which will be given later. Success de- 
pends much more on the manner in which the medicinal agents 
are used than upon the agent itself, and the strongest ones 
may prove perfectly useless if not properly applied. Nothing 
short of a thorough rubbing in of the salves will suffice, and 
this operation has to be performed many times. Of course the 
patient should be well fed, as even after the death of the par- 
asites the skin is for a long time in an inflamed condition. 
Cleanliness is here also the best preventive, and the diseased 
animal must be isolated and its old sleeping place should be 
thoroughly disinfected. 

There is still another species of Demodex, similar to the 
one infesting the dog, that has repeatedly been more or less 
injurious to cattle. Mr. W. Faxon first called attention to 
the diseased condition of cow-hides received in Boston from 
