Bristol news. [volume] (Bristol, Va. & Tenn.) 1867-189?, 1869-09-17

astcn themselves and feed on the mu-
,ous secretions otherwise, they perish. &
Becoming mixed with the food. they are I
into the stomach Here they {
,ubsist on the grastic juices, (ch, lrpo.
etic aud pauereatic fluids, and mucous
until they IRE fRi yrorn
yruJs. or reach the age If maturity,
Up to this period, they do not material
ly interfere with the health or comfort
uf the horse, in.so- much as they are
we'll supplied with food from the cou-
tents of the stomach aud the yiscreal
secretious. But when they have reach
cd this mStUre age, they cease to feed
and cease to grow, aud, like grubs r.
worms of other insccts,-as the silk
W run, the grass worm, and the various
moth beetles, and fly ,ribes-bccome
dormant after fastening themselves, and
enter the chysalis stage, so to speak
preparatory to coming out perfect flies
Just at this age they become dangerous.
1t is as natural for them to fir or bury
themselves when they have finished feed
ing and are going into their dormant
state, as it is for the silk worm to spin
its cocoon, the cotton worm 10 wind
itself in a leaf, or the grass worm to bu-
~ itself in the earth or beneath sofie
object, wherc, undisturted, it can pass
the chrysa'i state and como out in its
perfect state a moth. It is not in feed
ing, (though lie grub is carniverols)
but in seeking this resting place, this
grave, as it were, that they injuro the
stomach.
BY .un instructive common consent,
al Of mature age, at the same time, go
about this work by collecting into colo
MES and fastening themselves close to
gethcr, they mutually aid each othor in
the work Of penetrating the stomach
or other tissues. The younger crubs,
hat ,hed from different deposit of eggs,
do not join with those of mature age,
but bide their timo. When this fixing
, or Borrowing commences the horse gives
signs of pain, and if their work goes
on, it will surely prove fatal, sooner OF
: later, as the grubs may be in greater OF
less numbers. Should there be but
few, and the animal DO able to with
stand them, after given period they
batch--a wingless gal,ay is the product
This passes with the defccltcd focca
J, matter, when by exposure TO the az
u and the solar rays, its wings are rapid
ly produced, as in the horse and othe
!, flies. The perfect gad-fly is thus gcner
~ ated, male and female. In this stag
= they copulate, after which the NAL
}, dies, and the female goes on her worl
d of depcsiting her eggs, from two I
n three hundred or more instinctiyel
y, sceking place where the larvae con b
"a nourished with proper food.
O. Thus tracing the history Of one gene
ration, which is the history of ever
10 generation, we readily see why som
p have concluded that bots do no barn
lg They have been found in horses lyin
o. from other causes, or killed in goo
- health, where no signs of injury b
" them could be detected. They had NJ
III reached. in such cases, that age wht
ey they were bout to change to the chrys
I'd lis stage, for it is here, and Eere onl
that they are iujurio' to any materi
ut extent. When they are fastening ther
ed selves, on burying themselves, to chang
ss, to the perfect Hy, they do their e.
work, but failing to fasten, they pa
~. off doing no injury. They live on on
hat NAL food are fond Of the sweet tas
ny Of pus. When the eggs are deposit
IN on the COW, the Larvae sometimes bu
'as row into fife punctures made by 4
an back COW Ay. In this position, ST
fm ,oorking tail foremost, they, from {
rm irritation produced by the motion
an their sharp groppIcs, generate pus, mo
au than enough, at times, for their ov
ne consumption, and it terminates appa
Tor emily in boil. From this this thu
nd hatch the perfect fly. In the rabbit Il
an larvae are able to penetrate the tend
skin, where, in the same manner, tb,
no generate their own food by irritatio
"a 10 the nostrls of sheep they are al
'sy very troublesome, and their work
wo sometimes mistaken for distemper,
Is. Naturalists claim that these are all d
'ed ferent species of Hstrus BE that
is, it may, tLcir habits, their form, ttt
cs;; anatomy, and their natural historic
'ed are the same with this difference: tn
'ys one gains admission into the natu,
IL cavity, whilst the other finds or max
ed an artificial one Southern Cultivotc