Cuar. I. TWINING PLANTS. 23 
not wind round it. This apparently was due to the 
flexure of the shoot, whilst winding round an object 
so gently curved as this post, not being sufficient to 
hold the shoot to its place when the growing surface 
crept round to the opposite surface of the shoot; so 
that it was withdrawn at each revolution from its 
support. 
When a free shoot has grown far beyond its support, 
it sinks downwards from its weight, as already explained 
in the case of the Hop, with the revolving extremity 
turned upwards. Ifthe support be not lofty, the shoot 
falls to the ground, and resting there, the extremity 
rises up. Sometimes several shoots, when flexible, 
twine together into a cable, and thus support one 
another. Single thin depending shoots, such as those 
of the Sollya Drummondit, will turn abruptly back- 
wards and wind up on themselves. The greater 
number of the depending shoots, however, of one 
twining plant, the Hibbertia dentata, showed but little 
tendency to turn upwards. In other cases, as with the 
Cryptostegia grandiflora, several internodes which were 
at first flexible and revolved, if they did not succeed in 
twining round a support, become quite rigid, and sup- 
porting themselves upright, carried on their summits 
the younger revolving internodes. 
Here will be a convenient place to give a Table 
showing the direction and rate of movement of several 
twining plants, with a few appended remarks. These 
plants are arranged according to Lindley’s ‘ Vegetable 
Kingdom’ of 1858 ; and they have been selected from 
