altering the Daily Period of L ight. 
37 
Indian Corn No. 1. 
There were six plants in each row. One row was darkened for thirty- 
four hours, or an average of two hours daily, the actual time of darkening 
varying from thirty-five minutes to six hours on any one day. 
On 29 July the exposed plot had three plants with staminate inflo¬ 
rescences protruding, while on the darkened plot only one was protruding. 
Indian Corn No. 2. 
There were nine plants in each row. The period of darkening amounted 
to fifty-nine and a half hours, or an average of three and a half hours daily, 
the actual time of darkening varying from one hour to seven hours on any 
one day. 
On the exposed plot five plants had staminate inflorescences protruding 
on 29 -July, while on the darkened plot there were four with staminate 
inflorescences. 
Indian Corn No. 3. 
There were thirteen plants in each row, which were afterwards reduced 
to twelve. The period of darkening amounted to eighty-five hours, or an 
average of five hours daily, the actual time of darkening varying from one 
and a half hours to eight hours on any one day. 
On the exposed plot on 29 July eleven plants had staminate inflo¬ 
rescences protruding, while only one was visible on the darkened plot. 
On 23 August twelve plants on the exposed plot bore pistillate 
flowers, while on the darkened plot there was only one with pistillate 
flowers. 
The plants were pulled up on 8 September with the following results : 
Exposed plot 
Darkened plot 
Average height 
Tallest 
Total 
of stem. 
plant. 
eight. 
cm. 
cm. 
grm. 
124-35 
I 53-67 
2 353-000 
81-23 
1 21.92 
1247.380 
Wax Bean No. 1. 
There were seven plants in each row. The period of darkening was 
the same exactly as in Indian Corn No. 1, and averaged two hours daily. 
On 20 July three plants were in flower on the exposed plot, while there 
was only one on the darkened plot. 
The plants were pulled up on 23 July with these results : 
Average height 
Tallest 
Total 
of stem. 
plant. 
weight. 
mm. 
mm. 
grm. 
Exposed plot 
393-7 
5°5 
i 4 t ' 75 ° 
Darkened plot 
382.6 
45 2 
134-660 
