J. C. Draper—LEvolution of Structure in Seedlings. 895 
Evolution of structure in. the light. 
Table IL—Seedlings grown in the light. 
E, F. G. 
Weight of seed. 288, 426. 462. : 
Period 1, _ 6thday. — 6th day. 
. 2, ith.day.. _ 7th. “ 7th day. ith “ 
>: 3, 8th “ 8th “ ah * 9th “ 
by 4, 12th: * 9th “ 10th “ 10th “ 
‘y 5, 15th “ lith “ 14th “ 12th “ 
“ rea 13th “ Dt toto <3 14th “ 
6, 
Table II. was obtained in the same manner as Table I, the 
While the general character of the evolution in both series 
t. In IL the leaves 
455 of seeds in the dark produced 184 of dry plant, while 
455. & light "“" 41g #4 
A comparison of the parts below the ground with those above 
(both being dried at 212° F.) shows that the proportion of root 
to total weight of plant was also nearly identical ; being, 
25 of root for 100 of plant in the dark, and 
os 8 100 : light. 
The close similarity in the evolution of visible structure in 
the light and in the dark, the small difference in the tot 
Weights of the plants grown in the same time in both series, 
and the close approximation in the proportional weight of root 
to re all justify the conclusion, that the growth in darkness 
and in light closely resemble each other, and that it is proper 
to reason as regards the nature of the action from the first to 
the second. “ 
Another interesting fact which lends support to the opinion 
that the process of growth in seedlings developed in the dark 
