PLATE 4 
A. —Plants in can No. 18A, brought into blossom out of season by exposure 
to 13i-hour day, followed by reduction in day length. Plants in cans No. 17A, 
which had received a 12i-hour day and in No. 16A, a 10-hour day, and in B 
cans, a normal day length, all without buds or blossoms. Photographed April 
19, 1923. 
B. —Difference in height attributable to difference in length of day. Series A, 
grown under a 10-hour light exposure, and series B, under normal day length. 
Photographed August 18, 1922. 
