80 PARASITOLOGY. 
while the older inner portion assumes a grayish 
color. The condition is accompanied by itching; the 
animal rubs and scratches itself. Common in U. S. 
Parts Infested.—In man it is noted in the facial 
region and arms; sometimes contracted by handling 
infected pets. In horses it infests principally the 
body, but has been observed on the extremities. In 
cattle the facial region is a favorite location. In 
hogs we observe the body as the most usual part 
attacked; in dogsthe body and extremities ; in birds 
the dependent part of the head, as the comb and 
wattles. 
Modes of Intection.—Animals may become infected 
by coming in contact with infected ones, by being 
shipped in cars or boats in which infected ones have 
recently been transported, by being placed in other 
infected quarters, as barns, pastures, etc., or by 
using blankets, rub-rags, etc., which have recently 
been used upon infected animals. 
Treatment.—The most effectual remedial agent is 
iodine, which should be brushed on the affected part 
once a day; or, four percent nitrate of silver may be 
used. 
AcHoRION ScHOENLEINI (Achor—scurf ; Schoenlein) 
Disease——Tinea favosa; honeycomb ringworm; 
whitecomb. 
Animals Infested.—Infests by preference the smal- 
ler animals, as the dog, cat, bird, rat, mouse, etc. 
Symptoms.—The fungi implants itself in the skin 
at the opening of the hair follicle; here it forms a 
cup-shaped mass surrounding the hair or feather. 
Later the hair falls out, which gives the skin a honey- 
combed appearance. There is an odor given off 
