6 2 
DIP TERA. 
From the hinder part of the body of the perfeft 
infe£t 1 flues a whimble of wonderful ftruflure, it is a 
fcaly cylinder compofed of four tubes, which draw 
out like the pieces of a fpying glafs ; the laft is armed 
with three hooks * and is the gimblet with which 
the infeft bores through the tough hides of horned 
cattle. The animal feems to experience no pain, un- 
lefs theinfeft, plunging too deep, attacks fome nervous 
fibre ; in which cafe the bead runs about, and be¬ 
comes furious. The egg being hatched, the grub 
feeds on the matter cf the wound. The place of its 
abode forms upon the body of the quadrupeds a bunch 
fometimes above an inch high. When full-grown 
the larva breaks through the tumour, and hides down 
to the ground in the cool of the morning. It then 
digs itfelf a burrow, into which it retires. Its fkin 
grows hard, and turns to a very folid fhell. There 
it is transformed to a chryfalis, and afterwards to a 
winded infedt. 
Nature has provided for every exigence ; the fhell, 
wherein the ccftrus is enclofed, is of io ftrong a tex¬ 
ture, that it could not make its way out if there 
were not at one end a fmall valve, fattened only 
bv a very flight filament *, the firft pufh the ceftrus 
makes the door opens. 
Tar and milk, or tar, butter and fait, are faid to 
guard fheep and cattle from this inconvenience. 
The 
