Missouri Valley times. [volume] (Missouri Valley, Iowa) 1874-1931, 1911-11-23
SCIENCE APPLIED
TO DISCOVER the
PUTTY OF MILK
Agricultural Experiment Station
in Probe to Ascertain the
Quality of Milk.

AmeS. Ia.--Special Harry c. OAR
ser. = Sioux City boy VINO used to be
Tribune carrier, is probing into the
milk supply OF Sioux City and other
Iowa cities to find out lust how pure
II is. The agricultural experiment sta
ton OF Iowa State college is behind the
Sially to disclose he truth as to the
tuberculosis content of milk bought of
milk dealers in these cities.
Mr.. Darxer has gone some" since
the days he used TO tramp through cold
weather and hot to give sioux City
people their Tribrnea on Time BY hard
work he has put himself in the top
rank OF agricultural students at Iowa
State college His standing as an ex-
pert In dairying. in which he has spe-
cialized, may be gathered from the fact
that the college is financing the inves-
tigation. MIR. IDarger ranks high III
other college activities. Ne won hon
ors In debate last ysal and ;e is pron!
nent in various student organizations.
holding the presidency OF tlao Agricul
tural club of several hurt:sed mem
bers.
Experiments OH Animals.
Something Ike loo guinea pigs viii
be used by Mr.. DHrser in taking his
tests. The milk WIN be tried Oh them
to discover whether cr not it contains
tuberculosis germs LecaI3e guinea pigs
give the beat tests Samples of milk
VIII be gathered at intervals In the
cities selected and they will be taken
frcm bottles OF Other con ainers In
which milk is sold to Consumers without
any warning to dealers. Every precau-
ticn Will be taken 10 prevent con-
tam;nation OF lhe milk sample
after 1t il taken. II win be put in u
sterile flask and c,try Other vessel IN
which II is placed after ii caches the
college laboratory VIII also be steril-
ICED. Every snJnpls vail be kept sepa-
rate Throughout. the tests So the quality
of each dealers milk may be known
When the milk gamble reaches the
laboratory. part of j. will De plated"
TO. bacterial count. That is the way
the bacteriologist pats il That means
TINT bit of the MIX VIII l,e examined
to determine whsii Kind OF bacteria 1t
contains and how many and whether
they are harmful or not
Variety OF the investis cation.
The tuberculosis tests will be the
most Interesting. TIE. VIII be made In
several ways, TO make sure that they
are right. First. portion Of the milk
sample viii be put itio centrfugc for
30 minutes. That is = machine some
thing IKE cream separator tn prin-
ciple 1t sends tn cream in the milk
10 the top and tie sediment TO the bot
tom. Mi. Darger VIII then take out
,lle cream and sediment and inject 1t
into a guinea pig, ll.terperitonea!ly
he says; that means in the abdominal
membranes. second dig will lie in
oculuted with this saIaR material sub
cmianeously," meaning unGer the skin
The cream and sediment are chosen De-
cause the bacteria are heavier than
| milk and there fore go 10 the bottom
| with the sediment except as they get
| tangled up with Tie cream and go to
the TOP With it, All the bacteria are
! likely to be iii the cream and the sed;-
(! nent, therefore.
| Chemical Test.
| Another portion IF this sample Of
i milk will be treated with anti-fornin.
s. chemical which destroys all organ
isms but the tubercle bacllli. which
among all organisms can make the
hardest fight against destruction. This
sample Is then injected into third
guinea pig. Internationally" again
Hts special treatment was given it to
| get rid OF the organisms that might
! bring on peritonitis In the guinea pig.
| 1t provides sort OF insurance against
the Injection and the test going wrong
because OF complications.
The guinea pigs will be kept about
six weeks after incubation, that being
the time required for the development
VI luDeICuIOSlS. iisy VIII IleN De
killed End examined 70, tuberculosis
and the results recorded for each sam
pie of milk
The guinea pigs are used because
they are especially susceptible to tu.
berculosis. They provide test that Ia
considered about so times as sensitive
as the mcgoscopical method, but that
Will be used also.
/ Mr., rsrger will use the results Of his
investigations in his graduating thesis.
When they are compiled, they will also
be made public in the cities Interested