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This habit of dreaming is to a large extent due, I imagine, to their mode of sleeping flat on their backs on the heated floors, which warm their spines, and act on their brains; though it may also, in addition to that be accounted for by the intensity of the daily emotions re-acting by night on over-excited nervous systems.
The back is covered with shorter and stouter spines, of a triangular shape, extending to the very point of the tail also armed with a strong row of spines, which gives it a completely toothed appearance. The colour of this curiously covered back is grey, with irregular bands of chestnut-brown across it.
It rises with a perfectly straight, erect, slender, but firm and stiff, round stem, to a height of from 10 ft. to 30 ft., tapering from the base upwards, and furnished all the way up with short, horizontal branches, spreading about 3 ft. all round, like an immense candelabrum. Spines long, subulate, very sharp, ash-coloured, in clusters.
A.R. Wallace, the celebrated naturalist and traveller, describes as resembling an elm in general character but with a more smooth and scaly bark. The fruit is round, or slightly oval, about the size of a man's head, of a green colour, and covered all over with short spines which are very strong and so sharp that it is difficult to lift the fruit from the ground.
The trees were principally Castanospermum, Melia, Rulingia, and Sarcocephalus, and a beautiful tree belonging to the natural order Bombaceae, probably to the genus Eriodendron, with large spreading branches, which, as well as the trunk, were covered with spines.
They were very tall, with a thick, globe-shaped head of pinnate, plume-like leaves. But what rendered these trees peculiar was the stem. It was slender in proportion to the height of the tree, and was thickly covered with long needle-shaped spines, not growing irregularly, but set in bands, or rings, around the tree.
Its stem is very irregular in form, owing to the crowding of the tubercles, which look as if they were filled with water. The spines are small, in tufts of about half a dozen, set in a little cushion of yellowish wool. In size, the whole plant is like E. Mackieanus, but it blossoms more freely, as many as sixteen flowers having been borne at one time by a plant at Kew.
Leaves ½ in. apart, 3 in. to 6 in. long by 1 in. to 2 in. wide, oblong, pointed, with short petioles, and a small tuft of short, brown hair, with three or more reddish spines, in the axil of each.
They are of stiff, shrubby habit, about 4 feet high, and with branches thickly clothed with spines becoming brown with age. Leaflets oval in shape, deep green, with the upper surface rough to the touch, the under sides densely tomentose. Flowers single, fully 3 inches in diameter, the petals of good substance, and white or rose-coloured.
Flowers 2½ in. in diameter, sulphur-yellow, tinged with purple, produced in August and September. Fruit 2½ in. long and 1 in. thick, covered with cushions of bristles and spines. A native of Mexico, on dry, sandy soils, where its prostrate stems, clothed with powerful spines, form a hiding-place for the small animals, snakes, &c. Stove or warm greenhouse treatment is best for this species.
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