366 The Botanical Gazette. [June, 
Leaf II. 
LENGTH OF DalILy MEAN 
Dare. Lear. GRowTH. TEMP. Winn. 
Feb. 1 6.0 0.0 73.0 E 
2 9.75 3-75 73-5 E.-N. E 
yy 13.5 3-75 74.0 N.E 
4 18.5 ‘6 73.0 of 
5 25.25 6.75 v2.5 44 
6 33, 6.75 71,0 “ 
r 38.0 6.0 71.0 Me 
8 41.0 3.0 70.5 s 
9 41.5 5 68.5 = 
The same observations were continued during the develop- 
ment of two more leaves, but with these examples the measure- 
ments were recorded twice daily for the purpose of noting 
the relative proportions of the day and night growths. The, 
divisions of time were from 7:30 A. M. to 5:30 P. M., givinga 
period of day growth of ten hours; and from 5:30 P. M. to 7:30 
A. M., giving a night period of fourteen hours. The day per- 
iod represents approximately the hours that the sun was above 
the horizon. 
Leaf IlI.—Night. 
Dice. LENGTH oF NIGHT NIGHT Wind. 
Lear. GrowTH TEMP. 
Feb. 9 0.0 0.0 65 N.E 
10 5.75 75 64 i 
II 8.75 1,25 66 % 
12 13.25 1.25 62 NN. E 
13 16.5 1.0 60 fe 
14 22.25 2.0 65 > 
15 28.0 1.5 61 S. E. 
16 35-5 3.0 62 N. W 
it 41.5 1.0 62 ~~ > . 
I 45.25 : 62 ‘ 
19 47.0 . 63 Pont 
