46 PROGRESS OF VETERINARY SCIENCE AND ART. 
hyaena and bear. Going to the Jardin des Plantes, M. Bour- 
guignon discovered that two of the guards had become 
affected with scabies ever since M. Borelli’s lions had been 
kept there, and one of the guards had communicated the 
disease to his wife. 
Under appropriate treatment, the men speedily got well, 
and the lions too were recovering from the general sickly 
state in which they were, but being kept badly, two more, 
with the hyaena, soon died. 
It results, says Bourguignon, from all these facts, that five 
lions, brought to Paris, in a miserable state of health, and 
already affected with mange, as they communicated it to the 
guards of the Jardin des Plantes, have transmitted the affec- 
tion, in a direct manner, to five persons; and in an indirect 
way, a cutaneous affection has been provoked, on three 
grooms and six horses ; it results, moreover, that this instance 
of contagion of scabies from an animal to man, the only one 
as yet scientifically demonstrated , may be explained by the 
absolute identity of the active element of contagion, viz., the 
parasite of man and the lion ; that a hyaena and a bear sub- 
mitted in vain for several months to the most powerful causes 
of contagion, have lastly ended by being absolutely contami- 
nated ; that lastly, the psora has assumed a very dangerous 
and even fatal form in these animals, perhaps because they 
were in the most favorable conditions to succumb under the 
affection. 
The important question which remains to be solved is, if it 
was the parasite proper to the lion, or the acarus of man 
that was the active element of contagion? Not having lions 
to experiment upon, Bourguignon has commenced some expe- 
riments with the cat, believing that there is some analogy 
between the mange insect of the two. Bourguignon inclines 
to the belief that the acarus discovered on the lions is the 
true acarus of the lion, as he finds the acarus of the cat 
almost identical to it; with the exception of some slight 
modifications of the secondary organs, the parasite of the cat 
is the same as that of the lion, only it is smaller. Thus 
Bourguignon believes the first cause of contagion in the 
Circus arose with the lions. 
On the other hand, by analogy, it may be presumed that 
the parasite of the cat will live on man, inasmuch as it is 
provided with all the organs to incise the epidermis, puncture 
the dermis, and proceed along the usual furrows beneath the 
cuticle. 
Bourguignon has taken some of the acari, found alive on 
the lions and on the hyaena, and placed them on the horse, 
