53 
effects as an artificial inserted rowel, issue, or seton, would do ; 
and these perhaps first suggested in ancient times to practitioners 
in medicine these very useful remedies. 
The cattle are subject at times to violent cephalic disorders 
and epidemics, especially in the warmer climates, which these na¬ 
tural cutaneous irritants or suppositories, as they may be called, 
may tend to avert; and they may operate in a more forcible and 
determinate way, in producing all the effects of the Gastricolar 
Oestri, already noticed, the skin having such a general sympathy. 
In respect to the riddance of them where they may be con¬ 
ceived mischievous, we may observe, that the larva of the 
Oestrus Bovis, which breeds in the backs of horned cattle, is so 
conspicuous, that it is more easily destroyed than the others: the 
injection of any corrosive liquor into the sinus would kill it; or 
by puncturing the larvae with a hot needle, introduced through 
the apertures in the skin, or even by simple pressure, they may 
be destroyed, afterwards extracting them, or leaving them to 
slough away, which I have frequently observed they do when 
crushed by a blow from the horn of the beast, or by any other 
accident, without any material injury to the animal. A man em¬ 
ployed for this purpose might, in half a day, in this manner 
destroy every hot on a large common, the beasts being suffered to 
pass one at a time in review before him. 
Of the Oestrus Tarandi, or Rhein-deer Gad-Fly. 
The Rhein-deer delights in the cold of the north, and appears 
destined most beautifully to fulfil by himself to the polar inhabitant 
the various offices of the horse, cow, and sheep, of the more south¬ 
ern regions, carrying burdens, giving milk, and affording clothing : 
and this worthy animal appears in a remarkable manner to suffer 
from the effects of the Oestrus, with which he is infested, more 
than the other domesticated animals, so much so, as to occasion 
o 
