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This alone is almost sufficient to show that chance does not determine the manner in which leaves are dragged into the burrows. Of the above 227 leaves, 70 consisted of the fallen leaves of the common lime-tree, which is almost certainly not a native of England. These leaves are much acuminated towards the tip, and are very broad at the base with a well-developed foot-stalk.
The long foot-stalk is much less sensitive, for a slight rubbing produced no effect, although prolonged contact with a stick caused it to bend. The two branches are sensitive on all sides, so that they converge if touched on their inner sides, and diverge if touched on their outer sides.
It is well known that several animals, belonging to the most different classes, which inhabit the caves of Styria and of Kentucky, are blind. In some of the crabs the foot-stalk for the eye remains, though the eye is gone; the stand for the telescope is there, though the telescope with its glasses has been lost.
This new Solanum bears a bluish flower like the others of the same tribe; the leaves are of a whitish colour, thick and woolly on both sides, scarce an inch long and near as broad. The thorns are very sharp and thick set, of a deep orange colour, especially towards the points. The flower stands on a foot-stalk 4 inches long, included in a rough calix of a yellowish colour.
They are formed of a long foot-stalk, bearing two short branches, which in old plants again bifurcate. The two branches are not of quite equal length; and as with the vine, the longer one has a scale at its base.
An attached tendril, on the other hand, contracts spirally, and thus becomes highly elastic, so that when the main foot-stalk is pulled the strain is distributed equally between all the attached discs. For a few days after the attachment of the discs, the tendril remains weak and brittle, but it rapidly increases in thickness and acquires great strength.
It is true, at any rate, that, in the fresh-water aquarium, the river and brook plants need no soil but pebbles; and that the marine plants have no proper root, but are attached by a sort of sucker or foot-stalk to stones and masses of rock.
The wings are of different construction, some being like a divergent tuft of hairs, others are branched like feathers, some are elevated from the crown of the seed by a slender foot-stalk, which gives, than a very elegant appearance, others sit immediately on the crown of the seed. Nature has many other curious vegetable contrivances for the dispersion of seeds: see note on Helianthus.
We are thus led to conclude, that with pine-leaves there must be something attractive to worms in the base, notwithstanding that few ordinary leaves are drawn in by the base or foot-stalk. Petioles. We will now turn to the petioles or foot-stalks of compound leaves, after the leaflets have fallen off.
Three parts of his time he spent in contemplation of a special leaf. It was hard to tell wherein lay the fascination. He had spun a silken carpet on it. At rare intervals he tore himself away and snatched a hurried meal, but he infallibly returned to its friendly shelter. He rested on its mid-rib, facing the foot-stalk.
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