Vitamin B 2

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Abstract
Glass causes abnormally long foliage and reduces sideshoots in winter wheat grown in full daylight. The same effects are produced by tungsten lamps and to a less extent by Cooper-Hewitt lamps. 7-8 hrs. daylight daily through window glass at 59[degree]F. produced nearly normal plants during their early vegetative stage. 2-3 experimental crops of winter wheat can be obtained in 12 mo. by holding small seedlings near 32 [degree]F. in the dark for 65 days or by growing plants in an 8-hr. day at 50[degree]F. for 36 days, then 60 F. for 18 days, following either initial treatment with long days at 70-95[degree]F.