Transpiring Branches. 
June 19. 10. 1 5-1 1.45 a.m. 
Shoot C. 
755 
0-15! in. 
( 4 °°) 
12-12.40 p.m. . 
355 
o-i6f „ 
(212) 
i2.45-:r.3 0 p.m.. 
143 
° _I 5 | 55 
(82) 
1.50-5.20 „ . 
. 61 
0-1 „ 
(61) 
5.35 p.m. 
. indicator 
= 16* „ 
June 20. 3.5-9.45 p.m. . 
. leafless stem 
— >> 
Shoot D. 
June 24. 1 p.m.-g p.m. . 
594 
0-23 in. 
(250) 
„ 25. 9.50 a.m. -4 p.m. 
344 
? 
W 
00 
tOH 
4.30 p.m. . 
. indicator 
00 
1— ( 
1! 
4-45 >> 
• >> 
00 
II 
The bulk of the branches themselves, as distinguished from 
the leaves which they bear, seems to have some relation to 
the suction-force of a shoot. For instance, a shoot (C) of 
Beech, from which all the leaves had been removed, gave 
(June 22) a maximum tension of 8f in. Next day about 
18 ft. of lateral branches were cut off, leaving a bare main 
axis about 3J ft. long, which gave a maximum tension of 
5J in. : the two experiments were of about equal duration 
(23 hours). 
In connexion with these observations it is worthy of note 
that in the earlier experiments on the effect of the removal of 
leaves, I was careful to close the cut surfaces of the branches 
by means of melted paraffin in order to exclude air ; but in 
the later experiments I omitted this precaution (e. g. Beech 
shoot C) without any apparent effect upon the tension subse- 
quently developed. This was also the case in an experiment 
with Helianthus : a shoot had developed and maintained for 
some hours a tension of 7I inches ; I cut off the two largest 
leaves at 3.30 p.m., leaving the wounds open ; at 3.45 the 
tension was still 7J inches. I then cut off all the remaining 
leaves, readjusted the apparatus to zero, and obtained the 
G g 
