Manito eBooks

It moved, however, in the
evening in the same direction as before, but the line followed was not so
straight. During the morning the tied arch moved in an irregularly
circular, strongly zigzag course, and to a greater distance than in the
previous case, as was shown in a tracing, magnified 18 times. The movements
of a young plant bearing a few leaves and of a mature plant, will hereafter
be described.
Fig. 16. Tropaeolum minus (?): circumnutation of buried and arched
epicotyl, traced on a horizontal glass, from 9.20 A.M. to 8.15 P.M.
Movement of bead of filament magnified 27 times.
[page 28]
Citrus aurantium (Orange) (Aurantiaceae).--The cotyledons are hypogean. The
circumnutation of an epicotyl, which at the close of our observations was
.59 of an inch (15 mm.) in height above the ground, is shown in the annexed
figure (Fig. 17), as observed during a period of 44 h. 40 m.
Fig. 17. Citrus aurantium: circumnutation of epicotyl with a filament fixed
transversely near its apex, traced on a horizontal glass, from 12.13 P.M.
on Feb. 20th to 8.55 A.


Pages:
39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63