The evening times. [volume] (Grand Forks, N.D.) 1906-1914, 1913-01-13
No principal. however. is regarded
as scientifically established until II

No principal. however. is regarded
as scientifically established until it
has been confirmed through repetition
OF the experiments by other observers.
Accordingly at the request Of DR..
Rosenau. Drs. Anderson and Frost of
the public health and marine hospi-
tai service at Washington. working
on the basis Of the facts attained at
the medical school, repeated the ex-
pertinent and proved that the disease
which developed In monkeys bitten
by infected stable flies was infantile
paralysis by injecting another set of
monkeys bitten BY the fiies. Thus the
proof that the fly carries the virus,of
the disease is complete.
The stable fly. which has thus
proved so dangerous. is much like the
house fly. to which It is closely related
and for which 1t is frequently mis-
structure and distribution. The adult
fly. We are told, feeds exclusively. on
blood, biting various animals, and.
less commonly. human beings. Cattle
and horses are particularly pestered
by them during late summer, and
hence the fies are common in
the country. or near stables or barns
conditions. however, the fly occurs al
most everywhere.
Although the flies are found near
human habitations. they do not inter
houses 30 commonly as does the or
binary house fly. but rather remain
attracted elsewhere to feed. Their
normal food consists Of the blood of
mammals, and during It's lifetime each
fly feeds every two or three DAVIS,
perhaps. %oftener, upon some warm
FLOODED animal. The habit Of this
insect Of staying u Of doors in good
tradition that house flies bite before
9 rain, which is based upon the fact
that at such times the stable H. Is
more apt to come indoors. It bites
more commonly. however. on Of doors
and IN bright. sunny weather. It has
been known to bite sometimes at night
near an electric light.
The table fly appears early in the
spring and becomes much more abund-
ant after midsummer, and persists in
considerable numbers late into fall.
after the house fly has begun rapidly
to disappear.
nsa Both : s4s.,,s are .vo' S,,ood !;Ssa s;;o. and
to feed unmolested. When thus en-
gorged they remain sluggish for a
time ana are apt to rest with the
wings somewhat more widely apart
than the house fly and with the body
more 0lStlnctly
II one Of the flies is closely exam
|ined from above as 1t rests. In this
position. the proboscis can be seer
projecting horizontally like the tip
OF a fine black pin directly forward
from the lower edge Of the head.
Viewed from the side. the proboscis is
seen to emerge from the lower side
of the head and then bend forward
at right angles for q distance about
the height Of the head, in shape some
what like a bayonet. When sucking
blood the proboscis IL Strengthened
so that It projects directly downward
from its attachment to the head. Since
In the house fly, when It Is at rest, the
mouth parts never project 50 as. to
be visible from above. the two species
can be thus distinguished.
The control Of the stable fly will
probably prove az difficult as that Of
the house fly. and Its eradication is
obviously impossible. The ordinary
fly traps and sticky fly papers which
have proved 50 useful in dealing with
the house fly are Of no practical bene-
fit in combating the stable fly. since
1t Is not attracted to the resinous coat
ing OF the paper. nor, since It's only
food in the adult condition 10 the
blood Of living animals. can 1t be-
tempted into traps. The Coming and
going" fly traps devised by Professor
Hodge. however. will undoubtedly
catch large numbers Of stomoxys IL
attached to tho doors and windows Of
Stablea and barns.