PARASITES AFFECTING THE SKIN 31 
should carefully dip all new sheep purchased or brought 
from another farm before introducing them into a clean 
flock. Isolation is a matter of the gravest importance, 
and pastures in which the disease has broken out should 
be avoided if possible (see also Appendix II,). 
Curative Treatment.—The first proceeding is to shear 
all affected sheep, whatever the season, for under cover 
of the fleece it is practically impossible to destroy the 
Psoroptes. The second is to supply the animals with 
large quantities of nutritious food, as an improvement 
in condition materially aids cure. 
Curative treatment is divided into two methods: 
1. “ Salving’’ and “‘ bottling.” 
2. Dipping. 
“ Salving ”’ consists in parting the fleece, and follow- 
ing this by inunction of the skin with mercurial ointment. 
“ Bottling ’’ is similar, but the medicaments employed 
are usually in the form of liniments, such as creolin, 
carbolic acid, tar, etc., in oil. 
Dipping is by far the best treatment. This must be 
performed twice, the second dipping being carried out 
after the seventh and before the fourteenth day, this 
having been found to be the period after destruction of 
the adult mites in which the eggs that have escaped 
destruction by the first dipping will have hatched out. 
This proceeding should be carried out three or four 
days after shearing. 
Various dips, many of which are proprietary, are in 
use, but the following are the most efficient : 
I. 
BR Arsenic .. = et .. 1b. 
Zinc. sulph. rae ae -» 5 1b. 
‘Aloes Be she ts sin Ube 
Aqua nF 4 ae -. 100 lb.=124 gals, 
The aloes must be first dissolved in a sufficient quantity of 
boiling water, and added to the remainder. 
