CLASS DIFFERENCES IN GENERAL INTELLIGENCE: II

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Abstract
The investigations carried out by Dr. Halsey and his co‐workers have revealed appreciable differences between the averages obtained by pupils from different socio‐economic classes in tests of ‘intelligence’ at the 11+ examination. In their view, however, the class‐differences thus indicated are the result solely of differences in environmental conditions. The following paper maintains that they are largely, though not wholly, due to differences in genetic constitution. The criticisms advanced by Dr. Halsey against the genetic theory are examined in detail, and appear to arise partly from erroneous theoretical assumptions and partly from inadequate data.

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