The sime results have been obtained by the present authors in Baeria graeidlis, Spinacea oleraeea, Silene Armeria, Rudbeckia bicolor and Lupinus luteus.***> This strain is known to have a critical dark period of shorter duration and to react more sensitively to short day treatment than the strain "Violet" used by the junior author6),
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Tashima et al. (1953) studied this question.
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