[296]

July 2d Sarracenia purpurea

[297]

Sarracenia

(no lettering same scale) Fig 123

July 3d to morning of 4th

[298]

Sarracenia purpurea circumnutation of Pitcher July 1878

(Sarracenia purpurea: circumnutation of young pitcher, illuminated from above, traced on vertical glass from 8˚am July 3d to 10˚ 15 a.m 4th.─ Temp 17˚to 18˚C. Apex of leaf 20 inches from glass, so that the movements greatly magnified.)

[298v]

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Chapter E 10

groups of plants which are still anemophilous, as these on the whole are less highly organised or differentiated than the entomophilous species.

Tagscott

There is no great difficulty in seeing how an anemophilous plant might have been rendered entomophilous. Pollen is a nutritious substance and would soon have been discovered and devoured by insects; and if any adhered to their bodies it would have been transported from the anthers to the stigma of the same flower, or from one flower to another. One of the chief characteristics of the pollen of anemophilous plant is its coherence incoherence; but pollen in this state can adhere to the hairy bodies of insects, as we see with some Leguminosæ, Ericaceæ, and Melastomaceæ. We have however better evidence of the possibility of a transition of the above kind, in certain plants being now fertilised partly by the wind and partly by insects. The common rhubarb (Rheum rhaponticum) is so far in an intermediate