DISEASES OF THE SKIN AMONG DOMESTICATED ANIMALS. 75 
favus, tinea favosa, tinea vera, erbgrind and wabengrind. The 
fungus can be transferred from these animals to man, and the 
reverse. The favus of dogs, cats, horses, rabbits and mice is also 
transferable from one animal to another; but it has not yet been 
possible to inoculate other animals with the favus of chickens, or 
with pure cultures of the same (Gerlach, Sehtitz.) 
Achorion Sclioenleinii forms a thick network of branching 
hyphse, amongst which we find round conidise, either scattered or 
en masse. The fungus can penetrate between the epidermic cells 
into the cuticle, the root sheaths of the hairs and even up into the 
hairs and feathers. 
In mammals the favus eruption is especially liable to be seen 
on the forehead, alee nasi, behind the ears, on the abdomen and 
the outer surface of the hind limbs. It appears as yellowish- 
white or sulphur colored, dry, mortar-like crusts. At first they 
are hardly as large as a pin’s head; but they gradually increase 
in size until they may attain a diameter equal to that of a ten 
cent piece and a thickness of 2-5 mm. 
They form round or elliptical, often concentrically ringed 
plates, the external surface of which is depressed centrally, giving 
it a cup shape. The dull and lusterless hairs that at first pene¬ 
trate the crust soon fall out. 
Under the crust we find a depression in the skin, covered 
with a vividly red epidermis. Asa rule a little hemorrhage fol¬ 
lows the removal of the cup. 
In fowls favus appears most commonly on the comb. There 
appear small, dingy white cup-shaped crusts, which, growing 
peripherally, gradually cover the entire comb. The eruption 
increases slowly at first, but later spreads more rapidly; and 
finally it may cover the head, neck and even the entire body of 
the animal. The feathers become dry and brittle, and eventually 
fall out; the animals lose flesh and finally perish of exhaustion. 
Treatment consists in the removal of the scutulse and the 
application of parasiticide remedies. Of these the most effica¬ 
cious are solutions of carbolic acid or creosote (1:10), red or 
white mercurial ointment, sublimate solutions (1:50-100), ben¬ 
zine ointment (1:4), tincture of iodine and pyrogallic acid oint¬ 
ment (1:10.) 
