DISEASES OF THE SKIN AMONG DOMESTICATED ANIMALS. 77 
The therapy of the disease is analagous to that of favus. 
The scales and crusts are to be removed with the aid of sapo 
viridis, and then anti-parasitic remedies are to be applied. Espe¬ 
cially serviceable are the tar preparations, carbolic acid, creosote 
(1:20), white, red and grey mercurial ointments, sublimate solu¬ 
tion (1:50-100), photogen with oil (1:4), naphthol ointment (1:10), 
naphtholin ointment, thymol solution, ehrysarobin ointment 
(1:10), and tincture of iodine. 
13.— Dermatitis Canadensis. 
In the year 1879 Axe described a skin disease prevalent 
amongst horses in England, under the name of dermatitis con¬ 
tagiosa canadensis pustulosa. It was seen later in Germany, 
where it was also designated impetigo contagiosa (Schinkelda? 
Burke), acne contagiosa (Dieckerhoff, Grawitz), English or Can¬ 
adian horse-pox. 
The malady is certainly mycotic in its nature, for not only 
has it been possible to vaccinate the purulent secretion upon 
horses, goats and rabbits (Siedamgrotsky), but a very small bacil¬ 
lus has been gotten pure from the virus, and the cultures have 
been successfully inoculated upon horses, cattle, sheep, dogs and 
rabbits (Dierckerhoff and Grawitz.) 
According to Schinkelda, the symptoms of dermatitis cana¬ 
densis are as follows: After an incubation of six to fourteen days 
the hairs on various places, and most frequently upon the back, 
appears rough, and on careful observation there can be seen pea 
to bean-sized vesicles, unaccompanied by itching, and filled with a 
watery serum, which later becomes purulent. As a rule the 
vesicles rupture in a few days and their contents dry up into 
thick, honey like crusts. These fall off, together with the hairs, in 
six to seven days, and leave behind rounded, pigmented and bald 
spots, covered with normal epidermis and never desquamating. 
Usually this ends the matter. But sometimes new vesicles 
appear in the neighborhood of the old efflorescences, and the 
constant and successive relapses may make the course of the dis¬ 
ease a very tedious one. 
The general health remains entirely undisturbed. There 
almost always occurs at some time during the disease swelling of 
