204 



CIKCUMXUTATION OF STEMS. Chap. IV 



aid of their sensitive petioles, but some of them also twmt 

 round supports ; but even these latter species do not begin to 

 circumnutate in a conspicuous manner whilst young. The 



Fig. 72. 



-- ^... 



TrotXBolum majtis(?): cirouranuUitiou of stein of young plant, traced on a 

 liorizontal glass from 9 a.m. Dec. 26th to 10 a.m. on 27th. Movement 

 of bend magnified about 5 times, and here reduced to half of original 

 scale. 



variety here trcate 1 of has a rather thick stem, and is so dwarf 

 that apparently it does not climb in any manner. We there- 

 fore wished to ascertain whether the stem of a young plant, 



consisting of two in- 

 ^'?-''3. tcmodes, together 3'2 



inches in height, cir- 

 cumnutated. It was 

 observed during 25 h., 

 and we see in Fig. 72 

 that the stem moved in 

 a zigzag course, indicat- 

 ing circumnutation. 



(6.) Trifolium resupi- 

 natum (Leguminosze, 

 Fam. 75). — When we 

 treat of the sleep of 

 plants, we shall see that 

 the stems in several 



.„..,. . , „ Leguminous genera, for 



Tnfohum rcs'ipinaiu:n ; circumnutation of . , ,, , tt n 



stem, traced on vertical gla*s from 9.30 mstunce, those of Hedy- 



A.M. to 4.30 r.M. Nov. 3rd. Tracing not , sarum, Mimosa, Meli- 



greatly mngmfie I, reduced to h.ilf of lotus, &C., which are not 



original size. Plant feebly illuminated ,. i • i i. 



from above. chmbers, Circumnutate 



, in a con spicuous manner. 



We will here give only a single instance (Fig. 73), showing 

 the circumnutation of the stem of a large plant of a clover, 

 Viifolium resupinatum. In the course of 7 h. the stem changed 



