Richards,— The Evolution of 
Experiment 24 . 
75 leaves of Diervilla sp. in each bell-glass. Weight, 50 
grams. Kept in warm room fourteen hours before experi- 
ment. 
Duration of Experiment. 
Temp, in 
Bell-Glass A. 
Temp, in 
Bell-Glass B. 
Difference. 
Temperature 
outside. 
June 20 
12.00 noon 
26-20 
26-20 
0-00 
26-10 
Leaves slit longitudinally at 12-00. 
First day 
1. 00 p.m. 
26-20 
26-20 
0-00 
26-10 
2.00 „ 
26-20 
26-25 
0-05 
26-10 
3.00 „ 
26-10 
26-20 
0-10 
26-10 
„ 
4.00 „ 
26-00 
26*20 
0-20 
25.90 
„ 
9.00 a.m. 
25-80 
25.90 
0-10 
25.90 
’’ 
12.00 noon 
25.80 
25*85 
0-05 
25*95 
Experiment 25 . 
Leaves and small twigs of Liriodendron tulipifera. About 
70 leaves, or 120 grams of leaves, in each bell-glass. Had 
been in laboratory one day before experiment was begun. 
At the end of the experiment the leaves, in bell-glass A, were 
found to be still quite fresh and turgid. 
Duration of Experiment. 
Temp, in 
Bell-Glass A. 
Temp, in 
Bell-Glass B. 
Difference. 
Temperature 
outside. 
June 24 5.00 p.m. 
26-20 
26-20 
0-00 
25.80 
„ 25 11.00 a.m. 
26-20 
26-20 
0.00 
25.80 
Leaves slit longitudinally and petioles cut at n.oo a.m. 
First day i.oo p.m.' 
26-20 
26-50 
0-30 
25.90 
» 3*3o „ 
26-20 
26.95 
0-75 
26-10 
„ 5*30 „ 
26-25 
26.90 
065 
26-OO 
„ 9.00 a.m. 
26.50 
26-90 
0-40 
25-80 
„ 3.30 p.m. 
26-20 
26.40 
020 
25-80 
Second day 6.00 „ 
26-20 
26-35 
0-15 
25-60 
„ 8.30 a.m. 
26-15 
26-20 
005 
25-60 
„ 1 2.00 noon 
26-10 
26-10 
000 
25-80 
