584 
MANUAL OF MODERN FARRIERY. 
ing of cerate may be applied, after which it will soon heal, 
in most instances. Sometimes, however, the flesh grows 
too rapidly and in too great a quantity; which must be 
checked by a mixture of red precipitate and burnt alum 
dusted upon it. When the discharge has changed from a 
green hue to a yellowish-white, it may then be assumed 
that the parts are healing ; and they should be brought 
together at the edges by gentle pressure, and kept so by 
adhesive-plaster; but care should be taken to leave free 
egress for the matter if it still continues to flow. To keep 
down the swelling the lower portion of the limbs may be 
washed with vinegar. 
VERMIN. 
Sheep are liable to be infested with various kinds of 
vermin, especially those that are lean and out of condition, 
as well as the young animals. Various kinds of insects 
deposit their eggs in the skin of sheep, which produce little 
tumours. These are the receptacles of the grub or maggot, 
after the eggs are hatched. The insects which lay their 
eggs in the skin of animals are provided with an instrument 
called an ovipositor, with which they penetrate the skin, and 
at the same instant they deposit their eggs. The tumours 
produced by the grub after it is hatched create considerable 
uneasiness to the sheep ; and when a single sheep has several 
of these in his hide, he will seldom feed well, from the 
constant irritation produced by the motion of the grub. 
The shepherd, when he sees this uneasiness manifested, 
should search for the tumours, and pick out the grubs with 
a pin, or squeeze them out with his thumb-nails, as there is 
always a small aperture on the surface of the tumour 
through which the grub escapes in due season. 
The sheep-tick, called hippobosca ovina , is also verj 
