(7.) Rubus idaeus (hybrid) (Rosaceae, Fam. 76).—­As we happened to have a young plant, 11 inches in height and growing vigorously, which had been raised from a cross between the raspberry (Rubus idaeus) and a North American Rubus, it was observed in the usual manner.  During the morning of March 14th the stem almost completed a circle, and then moved far to the right.  At 4 P.M. it reversed its course, and now a fresh tracing was begun, which was continued during 40 ½ h., and is given in Fig. 74.  We here have well-marked circumnutation.

(8.) Deutzia gracilis (Saxifrageae, Fam. 77).—­A shoot on a bush about 18 inches in height was observed.  The bead changed its course greatly eleven times in the course of 10 h. 30 m. (Fig. 75), and there could be no doubt about the circumnutation of the stem.

Fig. 75.  Deutzia gracilis:  circumnutation of stem, kept in darkness, traced on horizontal glass, from 8.30 A.M. to 7 P.M.  March 20th.  Movement of bead originally magnified about 20 times, here reduced to half scale.

(9.) Fuchsia (greenhouse var., with large flowers, probably a hybrid) (Onagrarieae, Fam. 100).—­A young plant, 15 inches in height, was observed during nearly 48 h.  The [page 206] accompanying figure (Fig. 76) gives the necessary particulars, and shows that the stem circumnutated, though rather slowly.

Fig. 76.  Fuchsia (garden var.):  circumnutation of stem, kept in darkness, traced on horizontal glass, from 8.30 A.M. to 7 P.M.  March 20th.  Movement of bead originally magnified about 40 times, here reduced to half scale.

(10.) Cereus speciocissimus (garden var., sometimes called Phyllocactus multiflorus) (Cacteae, Fam. 109).—­This plant, which was growing vigorously from having been removed a few days before from the greenhouse to the hot-house, was observed with especial interest, as it seemed so little probable that the stem would circumnutate.  The branches are flat, or flabelliform; but some of them are triangular in section, with the three sides hollowed out.  A branch of this latter shape, 9 inches in length and 1 ½ in diameter, was chosen for observation, as less likely to circumnutate than a flabelliform branch.  The movement of the bead at the end of the glass filament, affixed to the summit of the branch, was traced (A, Fig. 77) from 9.23 A.M. to 4.30 P.M. on Nov. 23rd, during which time it changed its course greatly six times.  On the 24th another tracing was made (see B), and the bead on this day changed its course oftener, making in 8 h. what may be considered as four ellipses, with their longer axes differently directed.  The position of the stem and its commencing course on the following morning are likewise shown.  There can be no doubt that this branch, though appearing quite rigid, circumnutated; but the [page 207] extreme amount of movement during the time was very small, probably rather less than the 1/20th of an inch.

Fig 77.  Cereus speciocissimus:  circumnutation of stem, illuminated from above, traced on a horizontal glass, in A from 9 A.M. to 4.30 P.M. on Nov. 23rd; and in B from 8.30 A.M. on the 24th to 8 A.M. on the 25th.  Movement of the bead in B magnified about 38 times.