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It is not difficult to imagine how this comes about: either a thicker line, or a greater stiffness or tenacity of the viscid fluid composing the web and attached to the point the spider drops from, causes one to fall slower than the other.
Where the land is quite level and is covered with herbage, and where the climate is humid so that much dust cannot be blown away, it appears at first sight impossible that there should be any appreciable amount of sub-aerial denudation; but worm-castings are blown, especially whilst moist and viscid, in one uniform direction by the prevalent winds which are accompanied by rain.
The sweet-scented Virginian Raspberry forms a rather dense, upright growing bush, fully 4 feet high, with large broadly five-lobed and toothed leaves, that are more or less viscid, sweet-scented, and deciduous. The leaves are placed on long, hairy, viscid foot-stalks. Flowers in terminal corymbs, large and nearly circular, purplish-red in colour, and composed of five broad, round petals.
But as the excretion is extremely viscid, it is no doubt a convenience to the aphides to have it removed; therefore probably they do not excrete solely for the good of the ants.
The stream of bright phosphorescent light which had surrounded its body when it first appeared had now, owing to there being but a minor degree of phosphorus in the brackish water, given place to a dulled, sickly, greenish reflection, accentuated however by thin, vivid streaks, caused by the exudation from the gills of a streaming, viscid matter, common to some species of sharks, and giving it a truly terrifying and horrible appearance.
It seemed to have become vegetable; to have degenerated in that rank, sunless air to lush lichen or spreading moss that grew in patches to the staircase and was viscid under the foot like organic matter. At each turn of the stairs were vacant niches in the wall. Perhaps plants had once been set within them. If so they had died in that foul and tainted air.
When any of these capillary glands are stimulated into greater irritative actions, than is natural, they secrete a more copious material; and as the mouths of the absorbent system, which open in their vicinity, are at the same time stimulated into greater action, the thinner and more saline part of the secreted fluid is taken up again; and the remainder is not only more copious but also more viscid than natural.
There was a pool of this kind a quarter of a mile away, where there were "diggings" worked by Patsey's father, and thither they proceeded along the ridge in single file. When it was reached they solemnly began to wade in its viscid paint-like shallows.
Sydenham has recorded, in the stationary fever of the year 1685, the viscid sweats flowing from the head, which were probably from the same source as those in the sweating plague above mentioned. It is very common in dropsies of the chest or lungs to have the difficulty of breathing relieved by copious sweats, flowing from the head and neck. Mr.
From this simple condition, which differs but little from that of a multitude of common flowers, there are endless gradations to species in which the pollen-mass terminates in a very short, free caudicle to others in which the caudicle becomes firmly attached to the viscid matter, with the sterile stigma itself much modified.
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