PLATE s 
A. —Grafts of the Baldwin apple, transplanted May 2 and exposed to 12 hours of 
light daily, beginning May 17. Plant at left is a standard Baldwin while plant at 
right is a Baldwin graft on dwarf (Paradise) stock. The trees in this senes grew 
vigorously throughout the summer. Only one individual of the control series exposed 
to the full length of day survived the transplanting. This individual grew very slowly 
till August, but thereafter there was a marked increase in rate of growth. Photo¬ 
graphed September 28. 
B. —Goldenrod (Solidago juncea). Plant at left exposed to electric illumination 
during the winter months from sunset till midnight, in addition to the natural day¬ 
light. Plants at center and at right exposed to natural daylight only. As indications 
of initial formation of flowering stems induced by the increasing length of day became 
apparent on March 10, these plants thereafter were allowed to receive only 7^ hours of 
light daily. Stem elongation was quickly checked and only the leaf-rosette type of 
activity was continued. 
