420 
BOTANICAL GAZETTE [JUNE 
experiment began November 30, at 12 noon, the plants being 
marked into 1™™ zones and placed horizontal. In the first plant 
the growth was in the root; 



















o ° 
2 Q Oo oO inw 
5 nN AN an te 
E oo on 
os a> a a oa 32. 
a oe ! i | | 
N 3 
a a CSC “rye 
o 
a $s ° . 
E a3 me _* 
3) 22 at ee 
3 N & aw “a 
an 
a 
= 
2 eel 00 INN 
5 ~Re oO morw 
rs) ° - 
ia oo & oe 
5 orm ial 
5 
; | 2. a ee 
s ite Fcared | 
fon) $s ao de 32 SE 3 9 
e oO . "OY 
0 
elds | Peers 
xy oe S| a -a 
3 N bp 
QA 
ye 
z ea no Oo 
ra) } ote Non» 
ry ° vo 
a 0-0 Sano 
—] be aoa He Ww 
oO _— 
+ =] DB 
& 25 : . 
Ee gq: aint 
ll Bi : bot 
a 3) ae Malet Le Mie 
2 settee 
b ae o°o 
ge Ba adore. 
G} 
5 N ba We _ 
=] 
A 
ai & vo 
S E 3) 
° Mod 4 a 
- See reer 3 
o Nae ~ 
—™~ 
Hime ee 
a Bet oe oe 
a Ewe # 
a Shek 
moo momn 
4 Sec. Ss 
— — 
“ A Ch + IUNO 

in the second, in the cotyledon and 
root; and in the others in the 
cotyledon. In the larger plants, 
with more rapid growth, the execu- 
tion of the curvature was prompter, 
and with the longer growing region 
the curve was farther from the tip; 
but it very evidently made no differ- 
ence whether the curve was in the 
root or the cotyledon. In either 
case it was obviously in the apical 
growing region, in immedidiate con- 
nection with the sensitive tip. It is 
interesting to note that in the 
youngest plants, when the cells of 
the apical meristem are probably 
not yet dividing actively, they 
already exercise their function in 
irritability. 
The next table contains nothing 
new, but is introduced to empha- 
size by numerous instances the fact 
developed in the preceding experi- 
ment that the curve in the cotyle- 
don is in exactly the same position 
in the apical growing region that 
it would be in older plants where 
the growing region is all in the 
root. In most of these plants the 
rudimentary root was less than 1™ 
long. The experiment began Janu- 
ary 16,9:00 A.M., when sixteen seedlings were marked and 
fastened horizontal; one proved unsound. 
The curve is a 
little farther from ]the tip than the most elongated zone, just 


