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Canna Warscewiczi

F. 145

[Figures]

(Same scale: both figures on same block, but much closer together ─ no lettering ─ The last dot in A to be on level with first dot in B, as is now the case.─

Canna Warscewiczi: Cannaceæ F (Fam. 2.)

circumnutation of leaf, traced on vertical glass, (A) in pairs from 11.30 am Jun 10th to 640 am on Jun 11th 11th, & (B) from 6.40 a.m on the 11th to 840 am on 12th. apex of leaf 9 inches from the vertical glass. Temp 16˚- 17˚C.

[95v]

18 629

Chap. E 10

grains weight of seed; so that this variety seems to be much more self-sterile fertile than the previous one. With Dr. W. Ogle found (Pop. Science Review, Jan. 1870, p. 52.) this a plant of this species when protected from insects was much more sterile than I did, with me, for if a plant protected by him produced only two small capsules. As showing the efficiency of bees, I may add that Mr. Crocker castrated some young flowers, and then left them uncovered: and these produced as many seeds as the unmutilated flowers.

─ ─ var. peloric. This var. is quite fertile when artificially fertilised with its own pollen; but is utterly sterile when though left to itself & uncovered, as humble-bees cannot crawl into the narrow tubular flowers.

Verbascum phœniceum (do) quite sterile.

─ nigrum. (do) quite sterile.} see my account of self-sterile plants.

Campanula carpathica (Lobeliaceæ) quite sterile.