Abstract
THE classical researches of Hamner1 on photo-periodism indicated that the flowering of short-day plants, such as Biloxi soybean, is dependent upon exposure to a certain minimum (‘critical’) dark period. Within certain limits, the length of the critical dark period is largely independent of the duration of the light period, but when the latter reaches 20 hr., flowering in Biloxi soybean will not occur even if the associated dark periods exceed the critical value. The possibility that the length of this limiting light period may vary with the duration of the dark period has apparently never been investigated.
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