Evening journal., 1900-02-27

tanning the special kind Of bacillus or
germ, then the inoculation is made with
a sharp needle.
The inoculations are also made in
rubber tube. which is filled with a
fluid such as sodium carbonate, which
prevents blood from clotting. A cork
with a lever in a U-shaped glass tube
filled with mercury is attached to the
first tube. The cork and marking lever
rise and fall with the blood pressure,
recording the variation on a paper sur
face usually blackened by a SCOT of
flame and wound around a spot as the
marker traces the record upon it.
When various nerves are stimulated
by electricity the pressure falls or rises,
as the case may be. Drugs are inject
ed into the blood vessels. such as
strychnine. alcohol, opium, cocaine.
acids, alkalis, salts or arsenic. and it is
thus determined whether they cause
a rise or fall of pressure in the blood
vessels, and how much What occurs
in aloweranimal holds likewise for man.
because the differences which exist are
only comparative and may be Judged ac-
cordingly.
EFFECT or REMOVING GLANDS.
When q certain organ called the pam
creas. which lies between two folds of
the intestines behind the stomach. is
removed in the dog it causes diabetes.
II only a small part Of it is allowed TO
remain in the body this disease does
not appear.
Another experiment on dogs is to re-
move the gland in the neck known as
. rrf. Ia, f.|a
animal will die, unless it is fed upon
the fresh thyroid glands of sheep. This
has been put into practical application
whenever there is any disease Of the
thyroid gland. Only a few years ago the
life OF the empress Of Germany was
saved by the administration Of thyroid
extract.
HOW THE BRAIN CONTROLS MUS
CLES.
One of the most important expert
ments of these days of advance in
medicine was made first on the dog,
then on monkeys, and finally confirm
ed in disease OF the brain In man. The
dogs skull was trephined and the cleo
trodes OF a battery made to stimulate
parts OF the brain. In this way it was
found that each spot on the brain had
a special function, and no other. When
one spot was stimulated the fOrefO0t
moved. another spot moved the hind
| leg, another the head, the neck. the
eyelids, the jaw, the pupil Of the eye
in short, each party Of the body Is rep
resented by more or less definite area
on the brain. But the right hemisphere
Of the brain only controls the left side
of the body, and vice versa.
This experiment is employed by sur
geons to diagnose epilepdc attacks
Thus il was found In q recent case that
the attacks always started with the
twitching of the little fingers o
was found that he had a tumol
pressing upon the spot of his righf
brain which controlled his little finger
When this was removed he soon recoy
cred perfect health.
INOCULAT1NG WITH DISEASE.
Rabbits, cats, turtles and frogs serv,
suffering mankind best for physiologi
cal experiments. Rabbits, pigeons
guinea pigs, rats and mice are employ
ed for the incubation of bacteria TO
the Pasteur treatment Of hydrophobia
for serum tests and for experiments il
pathology.
Rabbits are very susceptible to dis
ease germs. and are. therefore mucl
used. In the case of the rat and nous
there are many varieties. The viii
, ones die very easily in captivity. The
, are therefore. kept in separate cage
because of their cannibalistic tendency
and observed for two weeks before be
3 ing used. OF all ordinary animals IN
most susceptible to bacterial disease /
2 the guinea pig
d The inoculations are sometimes per
formed by means of the hypOdermi
syringe. Before use 1t is sterilized b
boiling In water for five minutes.