134 THE BEHAVIOUR OF PLANTS 
probably, the four axes which bear the leaflets are drawn 
closer together. The stalk of the leaf is also likely to 
| turn downward, and the entire leaf pre- 
sents the appearance shown in Fig. 162. 
When we pinched the leaflet, there 
was given to the leaf what we call a 
stimulus. The stimulus travels al] 
through the 
leaf, and in 
response to 
it the move- 
ment takes 

HN 
ES 4 f/ \ ~y 
iA, ap Y \) WN 
DHS 
ip if ¥\ \) 
iy tf ¥\ . 
Yow 
| v\ 
y| ¥\ 
LY \ 
an 
y| N 
yj ‘\ 
4 
Fig. 162. Position of leaf after move- 
ment has ceased. 
place. If we jar a sensi- 
tive plant suddenly, all the 
leaves close up and assume 
a droopi iti 
(tle: position, as hie aer ttre! 
shown in Fig. 163. 
after jarring. 

