Smithsonian Report, 1920 — Garner and Allard. 



Plate 6. 



1. Aster linariifol/u.s L. Plants in box on left exposed to light from 9 a. m. to 4 p. m. daily. In full 

 bloom when photographed June 24. Plants in box on right left out of doors during the test. Showed 

 no indications of flower heads when photographed June 24. 



2. Biloxi soy bean exposed to the light for seven hours daily. When photographed August 15, 1919, 

 all seed pods were mature and dry and the leaves were falling (compare plate 7). 



