. The biology of spiders. Spiders; Insects. 44 THE BIOLOGY OF SPIDERS (Fig. 29) and is by that limb laid upon the plain silk strand which the spinnerets are simultaneously producing. The effect is to render the threads of the web more adhesive to struggling insects, to encumber their legs and wings and further delay their escape. It produces also a bluish appearance in the threads of the web as a whole, not by any pigment in the silk, but by interference of the light, the process which gives to soap bubbles and oil-films their evanescent colour. These bluish webs, looking rather. Fig. 29.—The
. The biology of spiders. Spiders; Insects. 44 THE BIOLOGY OF SPIDERS (Fig. 29) and is by that limb laid upon the plain silk strand which the spinnerets are simultaneously producing. The effect is to render the threads of the web more adhesive to struggling insects, to encumber their legs and wings and further delay their escape. It produces also a bluish appearance in the threads of the web as a whole, not by any pigment in the silk, but by interference of the light, the process which gives to soap bubbles and oil-films their evanescent colour. These bluish webs, looking rather. Fig. 29.—The Calamistrum of Amaurobius, showing also a metatarsal scopula. untidy, like tangled masses of silk, are frequent enough in cellars, on wood palings and gate-posts, where they are spun by spiders of the genus Amaurobius, the commonest of the British cribellate species. A good deal of controversy has been held as to the exact significance of the presence or absence of this organ, a subject which will be discussed in its proper place in Chapter XV. Widely divergent views have been held and cribellate spiders separated from the rest by making them, on the one hand, a separate genus in the same family, and on the other, an entirely distinct Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Savory, Theodore Horace, 1896-. London : Sidgwick & Jackson
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