281 
C. Warburton 
There is first pruritus, then depilation, then formation of crusts. Many 
experiments have been made on the transmission of Sarcoptes from other 
animals to the horse, and of the horse Sarcoptes to other animals. Delafond 
and Bourguignon several times succeeded in transferring the human Sarcopt 
to the horse, where it burrowed galleries, but always died out after a short 
time. They also describe a case in which horses groomed with brushes and 
sponges which had been used to clean mangy lions contracted the disease— 
which was artificially cured. According to Neumann (p. 133) Wallraff reports 
a case of horses contracting scabies from mangy goats. 
There are many cases of the transference of the horse Sarcopt to man 
(e.g. Delafond and Bourguignon, Traite pratique, p. 295). It usually disappears 
spontaneously in from 15 days to 6 weeks, or at all events easily yields to 
treatment. 
Megnin (1893, p. 144), in May 1892, investigated an extraordinary case 
of very severe crusted scabies in man and found the sarcopt to be that of the 
horse. The patient had had charge of a horse hauling barges on the Oise. 
Neumann (p. 134) says “Sarcoptic scabies of the horse appears to be 
capable of transmission to the bovine species, though up to the present 
time no one in practice has observed this form of mange in cattle. The 
possibility of this transmission rests on facts published by Robert Fauvet and 
Grognier.” 
The following results of experiments by Delafond and Bourguignon on 
the longevity of the mite may be given here. 
(1) 10 d, 10 larvae and 10 $ in a glass tube covered with paper, in a room 
at temp. 10°-15° C. 
larvae died from 4th to 6th day, 
males „ „ 5th to 8th „ 
females ,, ,, 6th to 9th „ 
(2) Experiment repeated in a stable at temp. 15°-20° C. 
larvae died from 5th to 6th day, 
males ,, ,, 6th to 8th ,, 
females ,, ,, 9th to 10th ,, 
(3) When kept in tubes containing hairs and fragments of crust and litter, 
and moistened from time to time (at 15°-20° C.) 
larvae lived 10 days, 
males ,, 13-14 days, 
females ,, 14-16 ,, 
Gerlach kept the mites alive three or four weeks in a piece of mangy skin 
kept moist. 
Hering’s S. equi was the Psoroptes of the horse , 
