ore satisfactory method would be to employ a psychologist
to examine applicants for positions and to weed out the unfit. Any
business employing as many as five hundred or a thousand workers, as,
for example, a large department store, could save in this way several
times the salary of a well-trained psychologist.

That the industrially inefficient are often of subnormal intelligence
has already been demonstrated in a number of psychological
investigations. Of 150 "hoboes" tested under the direction of the writer
by Mr. Knollin, at least 15 per cent belonged to the moron grade of
mental deficiency, and almost as many more were border-line cases. To be
sure, a large proportion were found perfectly normal, and a few even
decidedly superior in mental ability, but the ratio of mental deficiency
was ten or fifteen times as high as that holding for the general
population. Several had as low as 9- or 10-year intelligence, and one
had a mental level of 7 years. The industrial history of such subjects,
as given by themselves, was always about what the mental level would
lead us to expect--unskilled work, lack of interest in accomplishment,
frequent discharge from jobs, discouragement, and finally the "road."

The above findings have been fully paralleled by Mr. Glenn Johnson and
Professor Eleanor Rowland, of Reed College, who tested 108 unemployed
charity cases in Portland, Oregon. Both of these investigators made use
of the Stanford revision of the Binet scale, which is especially
serviceable in distinguishing the upper-grade defectives from normals.

It hardly needs to be emphasized that when charity organizations help
the feeble-minded to float along in the social and industrial world, and
to produce and rear children after their kind, a doubtful service is
rendered. A little psychological research would aid the united charities
of any city to direct their expenditures into more profitable channels
than would otherwise be possible.

OTHER USES OF INTELLIGENCE TESTS. Another important use of intelligence
tests is in the study of the factors which influence mental development.
It is desirable that we should be able to guard the child against
influences which affect mental development unfavorably; but as long as
these influences have not been sifted, weighed, and measured, we have
nothing but conjecture on which to base our efforts in this direction.

When we search the literature of child hygiene for reliable evidence as
to t