OF PLANTS. 287
movements of creepers round their supports, are the most universal. In this last phenomenon especially there is something which resembles animal movements. While growing, creepers, it is true, if left to themselves, describe circles with their tips and by this means reach an object near at hand. But it is no merely mechanical cause that induces them to adapt their growth to the form of the object they have thus reached. The cuscuta does not twine round every kind of support: for instance, limbs of animals, dead vegetable matter, metals and inorganic substances are not used for this purpose, but only living plants, and not even all kinds not mosses, for instance only those from which it can extract nourishment by its papillae; and these attract it from a considerable distance." 1 The following special observation, communicated to the Farmer's Magazine, and reproduced by the Times (13th July 1848) under the title "Vegetable Instinct," is however still more to the point: "If a basin of water be placed within six inches of a young pumpkin-stalk, or of a stem of the large garden pea, no matter on what side, the stalk will approach the basin during the night and it will be found next morning with one of its leaves floating on the water. This experiment may be renewed every night till the plant begins to fructify. Even if its position be
1 Brandis, On Life and Polarity, 1836, p. 88, says: "The roots of rock-plants seek nourishing mould in the most delicate crevices of rocks. These roots cling to a nourishing bone in dense clusters. I saw a root whose growth was intercepted by the sole of an old shoe: it divided itself into as many fibres as the shoe-sole had holes those by which it had been stitched together but as soon as these fibres had overcome the obstruction apd grown through the holes, they united again to a common stem." And p. 87: "If Sprengel's observations are confirmed, even mediate relations are perceived (by plants) in order to obtain this end (fructification): that is to say, the anthers of the nigella, bend down in order to put the pollen on the bees backs, and the pistils bend in like manner to receive it from the bees. [Add. to 3rd ed.]
288
