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TABLE 3.—Rough or approximate comparability of scales for the measurement of natural intelligence

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1.25-1.50... 230-279 170–199 17, 1-19.5 8.0 8.8 2.9 28.4 0.6 Average serAbove 1.50 280-412 200-219 19.6–26.0 4.1 4.5 1.1 55.0 0.1 Average com- Capable of supe- High type of leader

geant. ficer. manding of

and in

material First - class executive

ities" of personality. other necessary qual"when backed by

[graphic]

aver

C

11.0-12.9.-1

80-90.---|63-74.

0.75--0.95.--/100-129

Low

age.

Ordinary worker under

direction.

Inserior

D

9.5-10.9...

70-80.

50-62

0.50-0.75...

50-99

Slow in adaptability;

supervision needed.

80-99/11. 6-13. 225. 0126. 3/26. 5 0.3 12. 9 Poor private Ordinarily drops

out of school at the end of 5 or 6

years' work. 40-79 9. 1-11. 5 17. 1 15.0 30.8 0.0 29.7 Exceptionally Barely literate, ed

poor private.

ucation equiva-
lent to 1 to 4
years of primary

schooling.
0-39 0-9.0 7.0 5.814.8 0.0 49.0 Barely intelli- Illiterate, not ca-

gent enough pable of school
for labor bat- training.
talion. No
military
value.

Very inferior D-, E 0-9.4.

Below 70.

Below 50.. Below 0.50.

0-49

Much supervision

needed. Upper
grades,“ borderline";
lower grades, "feeble-
minded." Cost of
supervision greater
than value of labor.
Untrainable socially
or economically.

Black rule suggests line of demarcation, so far as individual and family stock intelligence (but not necessarily other physical or personal qualities) is concerned, between immigrants
who probably would and those who would not contribute to the racial value of future American family stocks.

Reference: Memoir XV, National Academy of Sciences, “Psychological Examining into United States Army,” edited by Robert M. Yerkes. For page numbers see rank
of each column.

*

tions. In chart 7 the longer lines opposite the name of the particular group represent relatively superior intelligence. In chart 8, the reverse situation is shown in which the longer lines represent a relatively high incidence of inferior intelligence. It might be possible for a group to rate high in both superior and inferior intelligence, if it were extremely variable and had principally only superior and degenerate individuals, and practically no great middle class. But by comparing charts 7 and 8, we find that such situation does not exist. Thus the whole distribution in the low, medium, and superior intelligence groups is shown in chart 9.

TABLE 4.-Estimate of comparative natural intelligence of the total white and foreign-born populations of the United States (Basis: Psychological examination of 94,004 white men selected at random, but pro rata by States, in the United States Army, of whom 12,407 were foreign born (chap. VI, pp. 693

699, Psy. Ex. in U.S. Army, Mem. XV, Nat. Acad. Sci., 1921).]

Intelligence grade

Sample : Actual psy. chological examinaioc

Rough estimate of natural intelligence by letter-grade distribution of the whole white

population based upon the sample tests recorded in the preceding columns, under the assumption that the draft presented fair intelligence samples of the several nativity groups of the whole United States

Whole white population, 1920

General descriptive qualities of

grades

Class grade

Letter
grade

Popula- Popula.
tion group tion group

white foreign-
draft

born
94,004 men, 12,407 men,
per cent

per cent
distribu- distribu-
tion

tion

Per cent
distribu-

tion
(cumula-
tive from
lowest)

Number
distribu-

tion
(cumula-
tive from
lowest)

Letter-
grade fre-

quency
per 100,000
particular

group of
population

Foreign-born white population, 1920 Relative

frequency
of letter
grade in-

telligence

Letter- in 100,000
Per cent Number grade fre- of total
distribu- distribu- quency white draft
tion

tion

per 100,000 and in (cumula- (cumula- particular 100,000 tive from tive from

group of

foreign-
lowest) lowest) population born white

draft (white
draft=100
per cent)

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