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Fig. 104. Echeveria stolonifera: circumnutation of leaf, traced from 8.20
A.M. June 25th to 8.45 A.M. 28th. Apex of leaf 12 1/4 inches from the
glass, so that the movement was much magnified; temp. 23o - 24 1/2o C.
(13.) Bryophyllum (vel Calanchae) calycinum (Crassulaceae).--Duval-Jouve
('Bull. Soc. Bot. de France,' Feb. 14th, 1868) measured the distance
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.


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