14 MR. DARWIN ON CLIMBING PLANTS. 



Hop, with the revolving end always turning upwards. If the 

 support be not lofty, it falls to the ground, and, resting their, the 

 extremity rises again. Sometimes several shoots, when flexible, 

 twine together into a eable, and thus support each other. Singlo 

 thin depending shoots, sueh as those of the Solly a Drummondii, 

 will turn abruptly baek and wind upwards on themselves. The 

 greater number of the depending shoots, however, of one twining 

 plant, the ILibbertiu dentata, showed but little tendency to turn 

 upwards. In other cases, as with the Cryptostcgia yrandijlora, 

 several intcrnodes which at first wen' llexible and revolved, if 

 they did not succeed in twining round a support, became quite 

 rigid, and, supporting themselves upright, carried on their summit 

 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 

 Lindlcy's 'Vegetable Kingdom' of 1853; and they have been 

 selected from all parts of the series to show that all kinds behave 

 in a nearly uniform manner*. 



Twining plants not aided by tendrils or by irritable leaf-stalks. 



(ACOTYLEDONS.) 



Lygodium scandens (Polypodiacea 1 ) moves against the sun. 

 h. m. 

 June 18, 1st circle 6 [mg)- 



„ 18, 2nd „ G 15 (late in even- 

 „ 19, 3rd „ 5 32 (very hot day). 



Lygodium artificial!'. at moves against the sun. 



h. m. 

 June 19, 4th circle 5 (very hot day). 



„ 20,5th „ G 



h. m. 



July 19, 1st circle 16 30 (shoot very 

 „' 20, 2nd „ 15 [young)'. 



hi in. 



July 21, 3rd circle 8 



„ 22,4th „ 10 30 



(Monocotyledons.) 



IZuscus androgynus (Liliacese), placed in the hot-house, moves against the sun. 



h, m. 



Mav 24, 1st circle 6 14 (shoot very 

 „ 25,2nd „ 2 21 [young). 

 „ 25, 3rd „ 3 37 

 „ 25, 4th „ 3 22 



h. in. 



May 2G, 5th circle 2 50 



„ 27, Gth „ 3 52 



„ 27, 7th „ 4 11 



* I am much indebted to Dr. Hooker for having sent me many plants from 

 Kew; and to Mr. Yeitch, of the Koyal Exotic Nursery, for having generously 

 given me a large collection of tine specimens of climbing plants. Professor Asa 

 Gray, Prof. Oliver, and Dr. Hooker have afforded me, as on many previous 

 occasions, much information and many valuable references. 



