Evening star. [volume] (Washington, D.C.) 1854-1972, 1924-12-29

ernoon the some societies will gather
in the same places.
One of the papers of most out
standing interest to the general
public was that of Emmeline Moore
Investigator in fish culture of the
New York State conservation com
mittee. who told Of finding a new
type of heart disease in white fish
known to science as "bothriocephaia-
sis, which is caused by a larval
tapeworm.
The worm, DR.. Moore explained, be-
comes sequestered within the auricie
OF the fish. having migrated from va
rious tissues in their search for
blood" The disease becomes fatal.
the speaker explained, when the
worms eat lesion into the auricle,
causing hemcrrhage that brings in
terest in this discovery lies in the
fact that the same parasite is the
most common type of tdpeWo rm
found in human beings.
Endangers Food supply.
This type of parasitisnI," DR.. Moore
concluded, has two important eco
nomic bearings. One to the fisheries
and the other to human welfare On
the one hand. it strikes at the heart
of the food supply which this fish af-
fords in the natural waters to the
lake trout Both whitefsh and lake
trout harmonic we'll in the matter
of food relations"
ION the other hand. Bothriocepha-
lus is the only parasite common to
both fish and man. Infection by it
may be acquired by eating uncooked
fish Parasitism of this kind. though
common among fish eating peoples Of
Europe, has been considered rare in
America. Recent evidence shows,
however, that it is the commences
type of tapeworm infection in man"
The biological survey of the United
States Department of Agriculture has
devoted an entire exhibit in Central
High School. in conjunction with the
meetings of the delegates represent
ing the geological sciences, to point
ing out the danger the common rat
offers to mankind. Under the heading
of 'Vandals of the Night" the survey
points out that the only good rats
are dead rats
Destruction Vast.
While America sleeps" declares a
placard over the display, rats de-
stroy the entire labor of 200. 900 men.
and pestilence turks in their wake.
is destroyed every year by rats and
they have caused more untimely
deaths among mankind than all of
the wars OF history. The brown rat
is the worst animal pest in the
world"
Rats, the display concludes, are
not native TO America but were
brought here on settlers ships from
Europe just before the Revolution
airy War.
After showing complete methods
for building 'rat-proof homes" and
the safest way to poison rodents that
already occupy older houses, the
biological survey points out that
America pays 81 every year TO sus-
tain every rat in its territory. but
a hundredth of a cent will buy enough
material TO destroy one.
Elsewhere other experts were dis
cussing everything scientific from
physical factors influencing the dis
tributiou, growth and reproduction OF
shipworms on the Pacific coast to the
size of seeds in tomatoes, the floral
development of lettuce and the studies
relating to the handling of sweet
cherries and n description of how
the pitcherplant obtains nitrogen for
it's existence by devouring unfortu-
mate ll5cClS lndl INTO It's pllCH-
ers"
Psychologist Lectures.
DIR. knight Dunlap of Johns Hop
kins University. Baltimore. address.
ing the American Psychological AS
ISOLATION at George Washington Uni
versity. gave a lecture on Instincts
and Desires" The desire differs from
the instinct in three important points
as follows, the speaker declared:
First, the instinct is q force OF
energy which drives one TO certain
forms of activity; on the other hand
the desire is something one has.
Second, the instinct is a central
factor presumably having its locus
in the brain; the desire, on the other
hand. has its locus in tissues outside
of the nervous system.
Third, the instinct is really one OF
our faculties; the desire is not
Speakers at the general meeting
on psychology included DIR. Paul T.
Young Of the University of Illinois;