CHAP. IV. DICOTYLEDONS. 237 



(12.) Eclieveria stolonifera (Crassulacese, Fam. 84). The older 

 leaves of this plant are so thick and fleshy, and the young ones 

 so short and broad, that it seemed 

 very improbable that any circum- ^' ^^' 



nutation could be detected. A fila- 

 ment was fixed to a young upwardly 

 inclined leaf, -75 inch in length and 

 "28 in breadth, which stood on the 

 outside of a terminal rosette of leaves, 

 produced by a plant growing very 

 vigorously. Its movement was traced 

 during 3 days, as here shown (Fig. 

 104). The course was chiefly in an 

 upward direction, and this may be 

 attributed to the elongation of the 

 leaf through growth ; but we see that 

 the lines are strongly zigzag, and that *rf~^r\ 

 occasionally there was distinct cir- / 



cumnutation, though on a very small Echeverit stolonifera : circutn- 

 sca]e nutation of leaf, traced 



(13.> Bryophyllum (vel Calanchce) taMEUS A M. 28th. Apex 



calycinum (Crassulacese). Duval- of leaf 12* inches from the 



JOUVO ('Bull. SOC. Bot. de France,' glass, so that the movement 



p i lAi-v. IQCO\ -i j.t T was much magnified; temp. 



Feb. 14th, 1868) measured the dis- 23-24 l0 C. 



tance between the tips of the upper 



pair of leaves on this plant, with the result shown in the following 



Table. It should be noted that the measurements on Dec. 2nd 



were made on a different pair of leaves : 



8 A.M. 2 P.M. 7 P.M. 



Nov. 16 . .15 mm. . . .25 mm. ...(?) 



19 ... 48 ... 60 ... 48 mm. 

 Dec. 2 ... 22 ... 43 ... 28 



"We see from this Table that the leaves stood considerably 

 further apart at 2 P.M. than at either 8 A.M. or 7 P.M. ; and this 

 shows that they rise a little in the evening and fall or open 

 in the forenoon. 



(14.) Drosera rotundifolia (Droseracese, Fam. 85). The move- 

 ments of a young leaf, having a long petiole but with iis tentacles 

 (01 gland-bearing hairs) as yet unfolded, were traced during 

 47 h. 15 m. The figure (Fig. 105) shows that it circumnutated 

 largely, chiefly in a vertical direction, making two ellipses each 



