. Journal of agricultural research . Journal of Agricultural Research Vol. XVIII, No. 11 Effect of Length of Day on Plant Growth Plate 69 ^^# ,^ M ^5]^«B i *. feJ^-J ^^^ ^ 1^^ »^cf ^^i y ifi. <5tJ ,-^* W*^ dpP WIP jT^F - ^•^^fcr»^ , v---, JmLl^ A ; fr-* f^tttttf^^!^sJlJMlMi^ -i^i^A-^.. ? -i, -. ilBIl^ .. g^*^ .^i^ ^ » la^^z^fi^^^^/ir I^^HBHl^B&i Hllll^vtaBiB»2E ^.^ p^^- ^^^ F ^^ 4^^ wl W-^^rvi ^y. Journal of Agricultural Research Vol. XVIII. No. 11 PLATE 69 A.—Biloxi soybeans. Plants in box on right exposed to light from daylight to 10a. m. and from 2 p. m. to dark, a total of 9 to 10 ho

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. Journal of agricultural research . Journal of Agricultural Research Vol. XVIII, No. 11 Effect of Length of Day on Plant Growth Plate 69 ^^# , ^ M ^5]^«B i *._ feJ^-J ^^^ ^ 1^^ »^cf ^^i y ifi. <5tJ , -^~* W*^ dpP WIP jT^F - ^•^^fcr»^_, v---, JmLl^ A ; fr-* f^tttttf^^!^sJlJMlMi^ -i^i^A-^.. ? -i, -. ilBIl^ .. g^*^ .^i^ ^ » la^^z^fi^^^^/ir I^^HBHl^B&i Hllll^vtaBiB»2E ^.^ p^^- ^^^ F ^^ 4^^ wl W-^^rvi ^y. Journal of Agricultural Research Vol. XVIII. No. 11 PLATE 69 A.—Biloxi soybeans. Plants in box on right exposed to light from daylight to 10a. m. and from 2 p. m. to dark, a total of 9 to 10 hours dail). Plants in box on leftexposed to light from 6 a. m. to 6 p. m., or 12 hours daily. Note marked difference ineffectiveness of the two expostires in hastening fruiting and maturation. PhotographedSeptember 8, 1919. B.—Radish plant in which the seed stalk was transformed into a vegetative shootthrough the influence of the decreasing length of day. Photographed October 12. PLATE 70 A.—Maryland Mammoth tobacco in 8-inch pots exposed to light from 9 a. m. to 4p. m. daily. Seed pods full-grown when photographed August 15, 1919. B.—Control scries of Maryland Mammoth plants kept out of doors. No signs offlowering when photographed August 15. Effect of Length of Day on Plant Growth PLATE 70