“Whenever the lines became inadequate to the purpose for which they were intended, by adhering to any fixed body, they were immediately detached from the spinners and so converted into terrestrial gossamer, by means of the last pair of legs, and the proceedings just described were repeated; which plainly proves that these operations result from a strong desire felt by the insects to effect an ascent[167].” Mr. Blackwall has recently read a paper (still unpublished) in the Linnæan Society, confirmatory of his opinions. [167] Linn. Trans., vol. xv. p. 453. 6. “Without going into the particulars,” says Mr. Rennie, “of what agrees or disagrees in the above experiments with our own observations, we shall give a brief account of what we have actually seen in our researches. So far as we have determined, then, all the various species of spiders, how different soever the form of their webs may be, proceed in the circumstance of shooting their lines precisely alike; but those which we have found the most manageable in experimenting, are the small gossamer spider (_Aranea obtextrix_, BECHSTEIN), known by its shining blackish-brown body and reddish-brown semi-transparent legs; but particularly the long-bodied spider (_Tetragnatha extensa_, LATR.), which varies in color from green to brownish or grey--but has always a black line along the belly, with a silvery white or yellowish one on each side. The latter is chiefly recommended by being a very industrious and persevering spinner, while its movements are easily seen, from the long cylindrical form of its body and the length of its legs. “We placed the above two species with five or six others, including the garden, the domestic, and the labyrinthic spiders, in empty wine-glasses, set in tea-saucers filled with water, to prevent their escape. When they discovered, by repeated descents from the brims of the glasses, that they were thus surrounded by a wet ditch, they all set themselves to the task of throwing their silken bridges across. For this purpose they first endeavored to ascertain in what direction the wind blew, or rather (as the experiment was made in our study) which way any current of air set,--by elevating their arms _as we have seen sailors do in a dead calm_. But, as it may prove more interesting to keep to one individual, we shall first watch the proceedings of the gossamer spider.