The Transactions of the Microscopical Society of London, Band 10John Van Voorst, 1862 |
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Häufige Begriffe und Wortgruppen
algæ angles animals appearance arrangement artery Asterolampra Barbadoes Barbadoes deposit Beale become binocular body Bréb calcareous cartilage cells cellules centre character cilia Closterium Coccus colour connective tissue corpuscles costæ crystals dentine described diameters diatom disc distinct endochrome examination exhibited existence extremity fibrous tissue fluid Foraminifera formed material frond frustules genus germinal matter germinal vesicle glass granular granules Hydrodictyon inch Infusoria instrument Journal lacunæ larvæ layer length less lobes longitudinal margin masses of germinal membrane micro microscope MICROSCOPICAL SOCIETY minute molecules nerve fibres nuclei objects observed obtained organs oval ovary ovum paper papillæ plate portion present processes produced Professor puncta rays remarks round sarcode scales seen segments side slides space species specimens sporangium spores stage stellate striæ structure substance surface Synapta Tania tentacles tion transparent transverse tubes umbilical lines valve vesicle vessels Volvox zoospores
Beliebte Passagen
Seite 300 - There is no evidence of any fundamental modification or advance in the Foraminiferous type from the Palaeozoic period to the present time.
Seite 43 - The chief point in this application of histology to pathology is to obtain a recognition of the fact, that the cell is really the ultimate morphological element in which there is any manifestation of life, and that we must not transfer the seat of real action to any point beyond the cell.
Seite 299 - The ordinary notion of species as assemblages of individuals marked out from each other by definite characters that have been genetically transmitted from original proto-types similarly distinguished, is quite inapplicable to this group...
Seite 300 - the foraminiferous fauna of our own seas probably presents a greater range of variety than existed at any preceding period ; but there is no indication of any tendency to elevation towards a higher type.
Seite 47 - The black pigment-molecules may be diffused throughout the cell or concentrated in a mass, and all kinds of intermediate gradations may exist between diffusion and concentration. The change in colour is owing to these alterations in the molecules, the tint being light when they are concentrated and dark when they are diffused. Mr. Lister ascertained by experiment that their concentration is caused by exposure to the light, by death of the animal, * " On the Cutaneous Pigmentary System of the Frog.
Seite 51 - ... and of even intellect itself, is associated with layers of molecules which are unquestionably active in producing the various modifications of nervous force. These molecules are constant and permanent as an integral part of these tissues, as much as cells or fibres are essential parts of others, and their function is not transitory, but essential to the organs to which they belong. All...
Seite 291 - It is an astonishing fact that self-fertilisation should not have been an habitual occurrence. It apparently demonstrates to us that there must be something injurious in the process. Nature thus tells us, in the most emphatic manner, that she abhors perpetual self-fertilisation.
Seite 49 - Hence, although we see molecules combining in the forms of crystals and nucleated spherules, inasmuch as we have discovered the physical conditions on which they depend, and can produce them artificially, we have no difficulty in classifying these among purely physical phenomena, even when they occur in the interior of animals.
Seite 44 - I. By a molecule was understood a minute body, seen under high magnifying powers in all organic fluids and textures, varying in size from the four thousandth of an inch down to a scarcely visible point, which may be calculated at much less than the twenty thousandth of an inch in diameter.
Seite 220 - ... body supporting it are drawn out into a long, thin process. When the animal issues from its tube it protrudes the ciliary organ as a fleshy column, fringed along one side by a row of long, motionless cilia, but in an instant the column is twisted into a spiral, round which the ciliary wreath twines, and the cilia are set in violent motion, urging currents of water towards the mouth. C. maritima approaches in character, as to the number of spires in its rotatory organ, to C. Muelleri, while it...