The Microscope and Its Revelations |
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Common terms and phrases
angular aperture animal Animalcules antheridia antherozoids aperture appearance archegonia arrangement attached balsam body calcareous Canada balsam capsules cavity cells cellular cilia colour commonly composed consists contain curious cuticle diameter Diatomaceæ disk distinct Ehrenberg elongated endochrome envelope examination extremity fibres filaments fluid focus Foraminifera frond frustules furnished gelatinous genus glass gonidia illumination inch Infusoria instrument interior layer lens light magnifying power mass membrane ment Microscope Microscopist minute mode mounted mouth movement object object-glass observed ordinary organs orifice parenchyma particles peculiar plants plate polypes portion present primordial cell primordial utricle Prof prothallium Protophytes rays resembling Rotifera sarcode seems seen segments separated set-free shell side slide sometimes species specimens spicules spines spores stage stem stolons stomach stomata structure subdivision substance surface takes-place tentacula thickness thin tion tissue transparent transverse tube usually utricle valves Vegetable Volvox Vorticella walls whilst woody Zoophytes zoospores
Popular passages
Page 383 - ... there is no occasion for this mode of accounting for it, since the extraordinary means adopted by nature for the production and diffusion of the germs of these plants adequately suffices to explain the facts of the case. " The number of sporules which any one fungus may...
Page 68 - It is certainly a matter of surprise that opticians, especially on the Continent, should have so long neglected the very simple means which are at present commonly employed in this country of giving an inclined position to microscopes, since it is now universally acknowledged that the vertical position is, of all that can be adopted, the very worst.
Page 31 - Seriously, if we wish rural walks to do our children any good, we must give them a love for rural sights, an object in every walk ; we must teach them — and we can teach them — to find wonder in every insect, sublimity in every hedgerow, the records of past worlds in every pebble, and boundless fertility upon the barren shore; and so, by teaching them to make full use of that limited sphere in which they now are, make them faithful in a few things, that they may be fit hereafter to be rulers...
Page 313 - is not avoided but pushed aside ; or, if it be sufficient to avert the onward course of the frustule, the latter is detained for a time equal to that which it would have occupied in its forward projection, and then retires from the impediment as if it had accomplished its full course.
Page 197 - ... is practically the best for all ordinary purposes. Moreover, a lens of moderate aperture has this very great advantage, that the parts of the object which are less perfectly in focus can be much better seen ; and therefore that the relation of that which is most distinctly discerned, to all the rest of the object, is rendered far more apparent. Let me remind...
Page 665 - in which the honey is obtained when the organ is plunged into it at the bottom of a flower, is by
Page 197 - Continental microscopists may claim, in nearly all departments of minute anatomical, physiological, botanical, or zoological investigations, since the introduction of this invaluable auxiliary ; and it is well known that the great majority of their instruments are of extremely simple construction, and that their objectives are generally of very moderate angular aperture. Moreover, if we look at the date of some of the principal contributions which this country has furnished to the common stock, —...
Page 263 - ... between the two kingdoms, since there is no single character by which the animal or vegetable nature of any organism can be tested. " Probably the one which is most generally applicable, among those lowest organisms which most closely approximate to one another, is not, as formerly supposed, the presence or absence of spontaneous motion, but the dependence of the being for nourishment upon organic compounds already formed...
Page 595 - And thift the appearance of a section of nacre is such as to have been aptly compared by Sir J. Herschel to the surface of a smoothed deal board, in which the woody layers are cut perpendicularly to their surface in one part, and nearly in their plane in another. Sir D. Brewster appears...
Page 531 - ... called Hydra, which fabulous history informs us was destroyed by Hercules, in the lake of Lerna. They are by no means vegetarians, and have the capability of swallowing creatures as large as themselves. In the ordinary mode of multiplication little budlike protuberances are developed on their external surface, which are soon observed to resemble the parent in character, possessing a digestive sack and mouth. For a time, however, this cavity is connected with that of the parent, but at last the...