Conception Control and Its Effects on the Individual and the Nation, page 19 by Florence E. Barrett
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of intellectual parents. Mr. English concludes that the children of the professional classes, between 12 and 14 years of age, exhibit very marked intelligence, and he is convinced that the hereditary factor plays an altogether predominant part.
In another experiment, Miss Arlitt, of Bryn Mawr College, tested 342 children from primary schools in one district, who were divided into four groups:--
Group 1. Professional. Group 2. Semi-professional and higher business. Group 3. Skilled labour. Group 4. Semi-and unskilled labour.
Marked differences between the groups were shewn. The intellectual capacity was represented by figures as follows:--
Group 1 125 Group 2 118 Group 3 107 Group 4 92
A further research of 548 children, grouped according to the occupation of their father, gave its results in terms of the percentage of children in each group who scored a mark higher than the median for the whole 548. They are as follows:--
Professional group 85% Executive group 68% Artisan group 41% Labour group 39%
In the "Journal of Educational Psychology," Vol. IX, 1916, Mr. A.W. Kornhauser gives evidence from the examination of 1,000 children drawn from five schools in Pittsburgh.
Schools A and B were attended by children of unskilled manual workers.
Schools C and D by children of skilled artisans and small shopkeepers.
School E by children of parents in very comfortable circumstances.
The results are tabulated as--
Retarded, _i.e._, below average. Normal, _i.e._, average. Advanced, _i.e._, above average.
| Retarded. | Normal. | Advanced. A } Manual workers {| 45.2 | 47.1 | 7.7 B } {| 36.7 | 55.9 | 7.4 | | | C } Artisans, etc. {| 29.4 | 50.2 | 20.7 D } {| 28.8 | 50.2 | 19.5 | | | E Most comfortable | 12.7 | 62.7 | 24.6[A]
[Footnote A: I am indebted to Professor McDougall's book for information here given.]
These experiments all shew the trend of intelligence (and with it will power or power of concentration, and what we may