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abdomen Acineta acontia angle animal animalcules antennae appearance basal beautiful body bottom bristles calcareous cavity cells centre chitine cilia ciliary cinclis close cnida cnidce color colorless compound eyes contraction cornea creature Crustacea curious curved delicate diameter dilated discern disk ecthorceum edge eggs elegant examine extremity filaments flesh fluid front glass globules hairs head hooks horny inch insects interior irregular jaws joints knob labium layer length lengthened lens lines live-box longitudinal look mandibles margin maxilla Medusa membrane microscope minute motion mouth nacre obliquely observation operculum organs orifice otolithes oval ovipositor pair palpi Pedicellaria placed plates polypes portion proboscis projecting protruded resemblance round rows scales seen shell side skin slender species specimen Spider spines spinnerets spiracles spiral structure substance surface Synapta teeth tentacles terminal thick thin thread tiny tion tissues transparent transverse tube upper vesicles Vorticella whole wings Zoea
Page 59 - This experiment, then, demonstrates that the peculiar lineation of the surface of nacre (on which its iridescence undoubtedly 3 depends, as originally shown by Sir D. Brewster) is due, not to the outcropping of alternate layers of membranous and calcareous matter, but to the disposition of a single membranous layer in folds or plaits, which lie more or less obliquely to the general surface.
Page 87 - But if alarmed, he states, their velocity can be increased six or seven-fold, or to thirty or thirty-five feet in the same period. In this space of time, a race-horse could clear only ninety feet, which is at the rate of more than a mile in a minute. Our little fly, in her swiftest flight, will in the same space of time go more than the third of a mile.
Page 214 - As the young lies inclosed within the membranes of the egg, the claws are folded on each other, and the tail is flexed on them so far as the margin of the shield, and, if long enough, is reflected over the front of the shield between the eyes. The dorsal spine is bent backwards, and lies in contact with the dorsal shield ; for the young, when it escapes from the egg, is quite soft, but it rapidly hardens and solidifies by the deposition of calcareous matter in what may be called its skin.
Page 213 - When they first escape they rarely exceed half a line in length. The body is ovoid, the dorsal shield large and inflated; on its upper edge and about the middle is a long spine, curved posteriorly, and rather longer than the diameter of the body, though it varies in length in different specimens; it is hollow, and the blood may be seen circulating through it. The upper portion of the body is sap-green, and the lower semitransparent. The eyes are large, sessile, and situated in front, and the circumference...
Page 160 - ... shifts to another, or to a different part of the branch, when she is either scared or finds it unsuitable. She commonly, also, takes more than one day to the work, notwithstanding the superiority of her tools.
Page 110 - ... the drum, and are attached to its under or concave surface. Thus the bundle of muscles, being alternately and briskly relaxed and contracted, will by its play, draw in and let out the drum, so that its convex surface being thus rendered concave when pulled in, when let out, a sound will be produced by the effort to recover its convexity, which...
Page 145 - In many instances, it is only by the bees travelling from flower to flower, that the pollen or farina is carried from the male to the female flowers,. without which, they would not fructify. One species of bee would not be sufficient to fructify all the various sorts of flowers, were the bees of that species ever so numerous, for it requires species of different sizes and different constructions." M. Sprengel found that, "not only are insects indispensable in fructifying different species of Iris,...
Page 88 - The swallow was in full pursuit, but the little creature flew with such astonishing velocity, that this bird of rapid flight and ready evolution was unable to overtake and entrap it ; the insect eluding every attempt, and being generally six feet before it.
Page 109 - These bundles consist of a prodigious number of muscular fibres applied to each other, but easily separable. Whilst Reaumur was examining one of these, pulling it from its place with a pin, he let it go again, and immediately, though the animal had been long dead, the usual sound was emitted. On each side of the drum-cavities, when the opercula are removed, another cavity of a lunulate shape, opening into the interior of the abdomen, is observable.
Page 74 - ... of a steel wire on the side of the jar, one stroke only being given at a time, and repeated at intervals of a minute or two ; when placed in a large basin of water the sound is much obscured, and is like that of a watch, one stroke being repeated, as before, at intervals. The sound is longest and oftenest repeated when the...