Diseases of the Skin —External Parasites. 205 
tumefaction of the skin where they had been placed ; in 
forty-eight hours the follicles contained a purulent fluid, in 
which young and adult acari and ova could be perceived. 
The eruption extended; but eventually the parasites 
disappeared, and a spontaneous cure took place.”* 
Symptoms.—These likewise are not so easy of distinction 
as in sarcoptic mange. At first, circumscribed tumefac- 
tions of the skin take place: these tumefactions are hot, 
and usually blotchy, or patched with red. In a very short 
time small pimples make their appearance, which rapidly 
become pustular, break, and exude serum, or, in severe 
cases, pus. The matter thus exuded forms scabs, or crusts 
-~the skin is thickened and chapped as in common mange. 
The itching attendant on follicular mange is not excessive 
nor continuous. The disease usually commences on the 
head, and from thence extends to the body ; it is of long 
duration, and very obstinately yields to treatment. 
Detached hair is rarely replaced, owing to the destruction 
of the hair follicle. 
Treatment.—The difficulty experienced in reaching the 
acari renders curative measures somewhat troublesome and 
unsatisfactory. Mercurial agents are, perhaps, the most 
useful. White precipitate, combined with sulphur and 
whale-oil, is a very excellent formula. 
The following ointment (my own prescription) has been 
in my practice attended with the best results in cases of 
follicular mange. 
Acid, Acetic ............65 dications 
Ol. Terebinth ....... sci ogeineduies é pan # drachms 
Ol. Var awsseas vevedeebewexs heaeeaeees 4 ounce, 
Ung. Hydrarg. ..ccscscsececereseee an | a 
lah - Miccpansnetescs useeaes .. 8 ounces, 
Whale-oil ....... sinle'sla slevn'sies seoeeee 10 
* Fleming’s ‘‘ Veterinary Sanitary Science,” vol. ii. p. 457. 
14 
