80 
Parasites of Cattle and Sheep. 
food is indicated. In fact, the general treatment against 
strongyles suggested for preventing attack of the stomach 
worms applies equally here. 
Attempts to cure “ husk ” with the means at our disposal 
will probably only lend support to the conviction that “ pre- 
vention is better than cure.” The administration of worm 
medicines by the mouth is still much relied on, and the 
inhalation of irritant gas, as chlorine and sulphurous acid 
gas, is sometimes practised, but neither of these can be relied 
on to effect a cure in cases in which there are large numbers 
of worms. The injection into the windpipe of chloroform, 
turpentine, carbolic acid, &c., is probably -more effectual. All 
should be carried out under direction of the expert. 
External Parasites of Sheep. 
“ The Maggot,” “Fly,” or “Worm.” — No parasitic attack is 
perhaps so widely known in Great Britain as that referred to 
under the above names. This, in late spring, summer, and 
early autumn, is the daily bugbear of the shepherd. It is 
particularly encountered in warm, damp, muggy weather, and 
in low-lying situations. Its occurrence is largely determined 
by moisture of the fleece, especially that due to the sheep’s excre- 
ment ; consequently it is most common in animals affected with 
diarrhoea, whose hinder parts are soiled, while wounds afford 
favourable conditions. It is not usually regarded as a serious 
matter, but it always interferes with the animal’s well-doing, 
and if neglected, may seriously affect its health and even end 
fatally. 
The condition is due to the maggots of true flies of one or 
more species. The flies credited with this power are Lucilia 
sericata , Lucilia Caesar (both of a bright golden green or 
greenish blue tint and metallic lustre), and Sarcophciga mag- 
nificat a large grey fly. The latter probably more commonly 
deposits its larvae or maggots in wounds. The flies deposit 
their eggs or larvae only on living animals, and not on dead 
flesh. Neither is the common meat blow fly. 
These parasites, with methods of treatment, were fully 
described by the Society’s Zoologist (Mr. Cecil Warburton) 
and by the late Sir George Brown in the Journal for 1902 
(Vol. 63, 1902, pp. 297, 298 ; 416-420) ; and leaflets on the 
subject are obtainable from the Society for gratuitous distri- 
bution. It is therefore unnecessary to give further details in 
this article. 
Lice or Pediculi. — The true louse of the sheep is the Tricho- 
dectes splicer ocephalus (Fig. 4), a small insect about one-sixteenth 
of an inch long, with a whitish body and broad red head, usually 
found sticking closely to the skin. It produces some irritation, 
