454 
8. SHERWELL 
in both, but one affected in spots over fully onedialf of sui 
face—one of which (the first and lightest case), seeing tha 
Unna, of Hamburg, had been doing a good deal of microscc 
pic work about that time on the achorion, I sent him, havinj 
previously gutted it and rubbed in a little arsenious acid iij 
abdominal cavity, enclosing it, as dry specimen, together witii 
preparation in small bottle of alcohol of a piece of sarcoma 
tous tumor, he had by letter requested me for. Later or 
February, 1892, t received a letter from him, saying tha] 
while it was undoubtedly favus, it had some unusual fea 
tures of microscopic growth differing from his well know;, 
classification of F. griseus, F. celerior and F. sulphureus tar 
dus. He sent as well a couple of tubes of pure cultures mad 
therefrom, which have been examined by various member: 
of New York Dermatological Society, but which, to my lesse> 
pert vision have no essential difference from that of othe 
favus. Certainly the microscopic appearance on the younji 
lady’s arm was as distinct as well could be, typically yellov 
and cupped. 
t have had several cases in my practice of this parasiti 
disease, evidently from contagion from the lower animals, an< 
beg to offer a photograph of one. A stableman being the pa 
tient, the patch in this case, as will be seen, is under the eye 
sharply defined isolated lesion; the scutula were absolute! 
typical and perfect. I scraped this case with dermal curette 
and applied liq. hydrargyri nitralis mildly, with cure follow 
ing as a matter of course. In this case also, I asked him t<j 
trap and bring me any affected rats or mice he could gel; 
with the result that two or three days thereafter he brough 
me a mouse, which I yet have in case, mounted by a taxidei 
mist of the vicinity. Ttie patch in this case is of grayish ye! 
low, and as in all cases I have seen is on the head. I hav 
invariably found the head and cheek the most affected par 
(in mice), whatever other regions were attacked, and this i 
a point which has for many years interested me. 
It would appear that the irritation caused by the pres, 
ence and growth of the fungus is very great in these lowe 
animals, and must lead apparently to almost continuou 
