OHAP. IV. 



MONOCOTYLEDONS. 



253 



part of the night. On the evening of the llth it circumnu toted 

 on a small scale for some time about the same spot. 



Fig. 115. 



A. ** 



Canna Warsccwiczii circumnutation of leaf, traced (A) from 11.30 A.M 

 June 10th to 6.40 A.M. llth ; and (B) from 6.40 A.M. llth to 8.40 A.M. 

 Apex of leaf 9 inches from the vertical glass. 



12th. 



(28.) Iris pseudo-acorus (Irideae, Fam. 10). The movements 

 of a young leaf, rising 13 inches above the water in which the 

 plant grew, were traced as shown in the 

 figure (Fig. 116), during 27 h. 30 m. 

 It manifestly circumnutated, though 

 only to a small extent. On the second 

 morning, between 6.40 A.M. and 2 P.M. 

 (at which latter hour the figure here 

 given ends), the apex changed its coiTrse 

 five times. During the next 8 h. 40 m. it 

 zigzagged much, and descended as far 

 as the lowest dot in the figure, making 

 in its course two very small ellipses ; 

 but if these lines had been added to 

 the diagram it would have been too 

 complex. 



(29.) Crinum Capense (Amaryllidese, 

 Fam. 11). The leaves of this plant 

 are remarkable for their great length 

 and narrowness: one was measured 

 and found to be 53 inches long and 

 only 1'4 broad at the base. Whilst quite young they stand up 

 almost vertically to the height of about a foot; afterwards 



Fig. 116. 



T 



Iris pseudo-acorus : circum- 

 nutation of leaf, traced 

 from 10.30 A.M. May 28th 

 to 2 P.M. 29th. Tracing 

 continued to 11 P.M., but 

 not here copied. Apex 

 of leaf 12 inches beneath 

 the horizontal glass, so 

 figure considerably mag- 

 nified. Temp. 15-16 C. 



