The Seattle star. [volume] (Seattle, Wash.) 1899-1947, 1923-12-04
HOW TESTS ARE
MADE FOR BLOOD

sitbts Iutk BiUub
Tho first test. Of course. n 10
discover whether tho stains really
were blood or whether they were
made BY something else.
I'VE scfapo some Of tho stain
OF the coat on glass slide and
mix IL thoroly with common salt
Then we treat the mixture with
glacial aeciie acid and cautiously
cvRpornta IL until qualification
commcncca Tho evaporation Is nc
compliAhod by heating. Tho slide
" then quickly cooled and placed
under tho microscope. II tho stain
is OF blood. brownish rhomboid or
tabular crystals Of hacmatin will
ahow. II the stain II not blood.
ihern viii b. no crystals
once Il IN established that the
stain is Of blood. VIC must test far
Their TO determine what kind Of
blood u U.s. There are four methods
of doing this. but tho biological
tea, r. the most dependable and NC
viii use that.
''ln II. Il II necessary 20 have q
serum that Il madn from comhsn-
alton OF human and animal blood
For emergency cases such an n
murder. like this. where haste In
the examination is necessary. we
get this serum from ono OF the uni
verslties Otherwise We mako our
own"
~How Is Il nader we inter
rupted
Blood IN taken from a healthy
man. as In taking an ordinary blood
trst, and IN then inocula,ed into
tho veins OF rabbit vr fowl Sci
ence has learned recently that a
rooster Is best for this purpose.
III. GOD DRAWN FROM
LIVING RABBITS HEART
~ week later sufficient blood for
tho experiment Is drawn off II Isn't
necessary 10 kin tho rabbit. or other
subject. A fino hollow needle is
stuck into It's heart and the blood
syTinged out without harrnlng the
animal. This mixture Of human and
animal blood then ia placed Into n
centrlfugo. which Is a machine that
yhlrls Il with centrifugal motion,
casting off all the heavy clements
and leaving only the thin, lIght.col.
ored serum. II Is this serum with
which wo work.
'sTha stain that we Bcraped from
the coat is dropped into test tube
and n solution OF nlne-tenths OF ! per
cent salt and distilled water added.
Then the mixture Is shaked until Il
has n faint pink color, and In poured
into n number Of other test tubes.
IAN equal amount OF the serum IL
INDEED in each test tube. This IL
added by means OF small hollow
needle.llke tube that permits II TO be
poured into the bottom OF the tube
and 10 rise 10 meet the stained water.
HUMAN BLOOD CAUSES
PRECPITATE IN TUBE
I'm from 30 minutes 70 two hours
after tho serum Ia added. II the stain
was human blood. n prccipltate Will
be deposited on tho bottom OF the
tube. and even before thai time there
win be a marked cioudlness in the
mixture. II the blood Is not human,
there will be no such preclpitate.
"WeiI. after finding that the blood
FaIn on Halls coat wns not human
blood, I tested for other animal blood
and found that chickens blood gave
the greatest reaction when ! tested II
with known human, animal and fowl
bloods.
Fowls and reptiles, you sec, have
nuclented blood corpuscles. which
when chemically treated and observ'
cd under The microscope, mako them
eaally dlstlngulshable as the cor
muscles OF humans and animals are
not indicated.
you might DO interested in know
Inc. too. that tho anthropold ape Is
The only animal whose blood reacts
10 fhe human blood test Maybe
prvan and some OF the other anti.
DarwlnIan theory fellows might like
10 know that, too. II they don't know
Il already"
"wen. i've got to be of. Tomor.
row I'm going 70 give you some in.
tarostina facts about this murder
er'sy hair. You'll recall that I found
several strands OF hair In the dead
mon'a' clenehed hand when I
gtraiehtened II out. Evidently no
Ind pulled II out In the death
struggle. It's really surprising how
much you can learn from n strand
OF hair.
"see you wednesday"
lseo tomorrow's Star for further
devcionmenta In Luke Mays man.