Abstract
Two two-way selection experiments, one for size and the other for duration of development, were designed in such a way as to prohibit any unconscious selection for the one trait through an uncontrolled selection for the other. Size and duration were measured in both experiments. All environmental factors known to influence duration of development or size in the one or the other respect were defined, controlled and kept constant as far as possible. It is shown that selection for duration of development, when not biased through selection for another trait, is ineffective; that major fluctuations in duration of development occur from generation to generation; that those fluctuations do not depend on genotype or environment as classically defined, but are, for a given generation, determined by the duration of development of its parental generation. The results are discussed in terms of the time dimension of morphogenesis.
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