. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. 248. Migration instinct. F, fence of netted line.'<; points of first departure; B, bridge lines for transit; assembly of spiderlings. 1, 2, 3, n, final test tlie effect of a current of air, I slightly raised an adjoining window, admitting a liglit play of wind across the fence on the column x. In three minutes two lines were fastened upon the cap of the j)uppet, and two spi- ders had begun to cross from the points marked 2,
. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. 248. Migration instinct. F, fence of netted line.'<; points of first departure; B, bridge lines for transit; assembly of spiderlings. 1, 2, 3, n, final test tlie effect of a current of air, I slightly raised an adjoining window, admitting a liglit play of wind across the fence on the column x. In three minutes two lines were fastened upon the cap of the j)uppet, and two spi- ders had begun to cross from the points marked 2, o. These lines were so del- icate that I had not seen them until the motion of the spiders along invisible bridges directed particular attention to the spots. Within an hour all the colony but two had crossed over the fence (F) to the puppet, and were swarmed around the head, face, and chest of the figure, and upon a mass of lines (n) that stretched to a wire (w). A triangular bridge of lines (B) had now been formed, whose apex was rioue*' the head of the puppet (z), and which broadened out, touching Habit. *'^® columns (y and x) and connecting with the first perpendic- ular bridge (F) by the three principal points (1, 2, 3) from which the migration had proceeded. In the course of three days, by arranging various elevated objects over the table, and breaking off the threads that floated beyond the prescribed limits, I had induced the brood to cover a space having a linear boundary of about twelve feet. The greater portion of the area thus bounded be- came at last sheeted by a web composed of the innumerable lines emitted by the little spiimers, so that the whole presented a quite good miniature of the canvas tents of a traveling circus company. For long periods the little creatures would hang quite still, separated from each other by distances varying from three-fourths of an inch to one, two, and three inches. In these rest- ing moments they hung inverted between two lines wh
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectspiders, bookyear1889
