This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1864 Excerpt: ...get under them, as a vacuum is formed beneath by the raising of their central parts. On the "Feet of Arachnidfe." By L. Lane Clarke. "Intellectual Observer," April, 1863. t See "Objects for the Microscope," by L. Lane Clarke, p. 65. There appears much to be said in support of this theory, and the sucker is an instrument by no means unknown in nature. The feet of a lizard--called the Gecko--are supplied with a contrivance of the kind, and this is also the case with some of the water-beetles; I have seen one of them hold on quite tightly to the edge of a basin by means of the suckers on its feet. It would appear, however, that the fly cannot "support its position" in this way. An acute observer of nature, Mr. Blackwall, at Manchester, noticed that flies under the glass of an exhausted air-pump were still able to adhere to it, and, in fact, could not be detached without the employment of a small degree of force. This observation led to many experiments being tried; and it was found that the adhering power exists, not exactly in the flat appendages, or pulvilli, but in the minute hairs which surround them, and being tubular and terminating in minute disks, partly act as suckers, and emit a fluid which makes the adhesion perfect. Fig. 4 represents a foot of the boat-fly, so called from its rowing itself in the water with a pair of feet much resembling oars. This is one of its hind See Mr. Hepworth's communications to the Quarterly Journal of Microscopic Science, vols. II and III. WHIRLIGIG BEETLE. 101 feet, and it will be observed that, besides being very flat, it is fringed with long fine hair, which adds considerably to its force as an oar. The insect (fig. 5) is a very singular one altogether, and very common in ponds a...
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