SINCE Galton, it is customary to consider that characters are due to nature or to nurture, or to both, and that there is no third cause. From a practical point of view, however, factors of chance can surely be supposed to play a part. To clarify this conception, let me take an example.
Dahlberg, G., Proc. Roy. Soc. Edin., B, 62, 20 (1943).
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Acta geneticae medicae et gemellologiae (1978)