ANALYSIS 01? CONTINENTAL JOURNALS. 7 47 
surrounding skin ; their centre is, on the contrary, depressed 
to a greater or less degree, a conformation that gives the 
crust the aspect of a cup. These capsules or favi are more or 
less numerous, and more or less extensive. In my first cat 
they were only two in number, but well defined, very 
regular, and they were not long in attaining the dimensions 
of a 50-centimes piece. With my dog they were extremely 
multiple, covering nearly the whole of the right portion of the 
cranium corresponding to the occipital [region, and a large 
surface of the ear of the same side ; but they were much 
smaller, and in general did not exceed from one to two milli- 
metres in diameter. 
This cup-shaped disposition is much less marked when the 
favus is seated at the base of the claw ; there it is most 
frequently only seen as an irregular heap of yellow, pitchy, 
split-up crusts, which the microscope, however, shows to he 
composed of the same elements as the others. 
At the free surface of these crusts there are often found 
dry bristly hairs that appear to pass through the entire thick- 
ness of the favous plate, and which are pulled out with the 
slightest amount of traction. At a later period these hairs 
fall off, unrooted by the progress of the disease, but not 
broken or sharply cut away close to the crusts as in herpes 
tonsurans. 
If the crusts are carefully raised, the skin beneath them is 
found to be thin and depressed, and looking as if atrophied 
by compression, though smooth, not ulcerated, and completely 
dry, or yielding a slight serous exudation ; sometimes pale 
and anaemic, more frequently red, irritated, and sufficiently 
transparent to show some very fine vascular ramuscules. 
Around the margin of the crust the skin is sensibly in- 
flamed, red, thickened, and rises into a somewhat salient 
prominence. 
Examined with the aid of the microscope, these crusts are 
found to he exclusively formed by the elements of an elemen- 
tary cryptogam — spores, mycelium, and sporophorous tubes — * 
that offers the most complete identity with that figured and 
described by MM. Fiebert, Bazin, and Ch. Robin as charac- 
teristic of the Acliorion Schonleinii .* These elements 
abound in an incredible profusion, and nothing is easier than 
to study them. 
The following is an abridged description of these diverse 
elements, such as I have frequently observed : 
The spores are small, spherical, very refringent bodies, of 
* Ch. Robin . — ‘Histoire Naturelle des Vegetaux Parasites,’ 1853, p. 411, 
et seq. 
