MOTION AND SENSITIVENESS IN CLIMBING PLANTS. 
65 
ready for action, as a polypus places its tentacula. If the tendril be dis- 
placed, it is acted on by the force of gravity, and rights itself. It is acted 
on by the light, and bends towards or from it, or disregards it, whichever 
may be most advantageous. During several days the tendril or internodes, 
or both, spontaneously revolve with a steady motion. The tendril strikes 
some object, and quickly curls round and firmly grasps it. In the course of 
some hours it contracts into a spire, dragging up the stem, and forming an 
excellent spring. All movements now cease. By growth the tissues soon 
become wonderfully strong and durable. The tendril has done its work, and 
done it in an admirable manner.” 
EXPLANATION OF PLATES. 
Plate Y. 
Fig. 1. Clematis glandulosa, with two young leaves clasping twigs, with the 
clasping portions thickened. 
„ 2. A young leaf of Clematis viticella. 
„ 3. Solarium jasminoides, with one of its leaves clasping a stick. 
„ 4. Solarium jasminoides. a. Section of petiole'; b. Section of a petiole 
some weeks after it has clasped a stick, as shown in fig. 3. 
„ 5. Bignonia, unnamed species from Kew. 
„ 6. Corydalis claviculata. Leaf-tendril, of natural size. 
Plate YI. 
„ 7. Tendril of the Yine. 
a. Peduncle of tendril. 
b. Longer branch, with a scale at its base. 
c. Shorter branch, d. Petiole of opposite leaf. 
„ 8. Flower of the Yine. a. Common Peduncle ; b. Flower -tendril, with 
a scale at its base ; c. Sub-peduncle ; d. Petiole of opposite leaf. 
„ 9. Ampelopsis hederacea. Tendril, with the young leaf. 
„ 10. Ampelopsis hederacea. Tendril, several weeks after its attachment 
to a wall, with the branches thickened and spirally contracted, 
and with the extremities developed into disks. The unattached 
branches have withered and dropped off. 
VOL. V. — NO. XVIIT. 
F 
