ON DROSERA ROTUNDIFOLIA 7 
The figures given in the tables are in hundredths of a milli- 
meter. Measurements were made on the drawings, which were 
checked by the direct measurements. The time at the head of 
the first column shows when the gland was stimulated. The 
column to the right of the heavy line shows the first indication of 
unbending. The segments were marked off naturally by the 
presence of glandular hairs on the two flattened surfaces. They 
are numbered from the apex to the base. The segments on the 
concave side do not always correspond to those on the convex side. 
TABLE I 
. = * Pal . . 
No. of gs vs esi gcled ese 
Segment |S a(Galfging Fal A/S is 
e Sy iesy sito 
=| 22 ]8= | 92 22/92 ee g 
Melba!) ar | a Fat] Fal) Mp! 
80} 80) 80} 80, 80 80) 80 80 80 80) 80} 80) 80} 80! 80) 80 80 
Abaxial side’ 
Adaxial side 
ena Au RW NH 
a 
°o 
‘4 
(=) 
5 
3 
b 
° 
s 
$ 
ae 
iS) 
Ba 
al 
S 
Ln | 
PA 
_ 
» 
Leal 
> 
I 
oe 
” 
J 
° 
z 
6 
<} 
° 
71207 2901499 
(c) EXPERIMENTAL DATA 
Measurements of the dorsal and ventral sides of a tentacle in 
the process of bending and unbending are givenin TaBLEI. The 
tentacle was selected from next to the outermost row on a fresh, 
red, young leaf which was secreting copiously. The leaf had 
been protected during its development and was not touched, or 
stimulated in any other way, prior to the experiment. Its reaction 
is typical of the marginal tentacles on young leaves, unless perhaps 
it is more than usually vigorous. 
The straight tentacle measured 2.94 mm. in length. The leg 
of a small house-fly was laid on the gland. One minute and a 
