Journal of the Royal Microscopical SocietyRoyal Microscopical Society, 1881 |
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Häufige Begriffe und Wortgruppen
acid air-angle algæ amplification angle angular aperture animals apparatus appear arrangement axial canal balsam become body cavity cell-wall cells centre chitinous chlorophyll cilia cœlom colour cone connected containing cover-glass Crustacea described diameter diatoms diffraction direct dry lens dry objective ectoderm emergent pencil endoderm enlarged epithelium equal exhibited eye-piece fact fibres filaments fluid focal length genus gives glands glass hemisphere illumination immersion objective inch increase Infusoria Journ Journal larvæ layer lenses light matter medium membrane mesoderm Micr micrococci Microscope mounted mycelium nucleus numerical aperture obliquity observed obtained opening optical ordinary organs paper papillæ plane plate portion produced Professor protoplasm radiant rays refractive index regard result screw sections seen segment side slide species specimens spherical spicule sponge spores stage striæ structure substage substance surface tion tissue tube vision whole Zool zoospores دو
Beliebte Passagen
Seite 194 - The Gods, who haunt The lucid interspace of world and world, Where never creeps a cloud, or moves a wind, Nor ever falls the least white star of snow, Nor ever lowest roll of thunder moans, Nor sound of human sorrow mounts to mar Their sacred everlasting calm!
Seite 193 - A mass of living protoplasm is simply a molecular machine of great complexity, the total results of the working of which, or its vital phenomena, depend on the one hand upon its construction, and on the other, upon the energy supplied to it; and to speak of 'vitality' as anything but the name of a series of operations is as if one should talk of the horologity of a clock, "f Professor J.
Seite 496 - ... traveller who wanders in an unknown country at the hour of twilight, at the moment when the light of day no longer suffices to enable him clearly to distinguish objects, and when he is conscious that, notwithstanding all his precautions, he is liable to lose his way.
Seite 600 - At any rate, as few of the colours in nature are pure, but almost all arise from the combination of rays of different wavelengths, and as in such cases the visible resultant would be composed not only of the rays...
Seite 649 - Ilyalotheca, division is less common. Now, although the actual following-out of the process of conjugation may be difficult, or perhaps impossible, I take it that when on several occasions the process of division is to be observed ; when, in such cases, the resulting frond is identically similar to other and frequently seen fronds ; when there is also at different times of the year, and perhaps in different years, complete similarity in the specimens examined ; and when no trace can be found, in...
Seite 497 - In order to render these numbers more comprehensible, let us seek the volume and the weight which may result from the multiplication of a single bacterium. The individuals of the most common species of rod-bacteria present the form of a short cylinder having a diameter of a thousandth of a millimeter, and in the vicinity of one five hundredth of a millimetre in length.
Seite 600 - ... the rest as red is from yellow or green from violet. The question also arises whether white light to these insects would differ from our white light in containing this additional colour.
Seite 630 - It is hardly an exaggeration to say that the tip of the radicle thus endowed, and having the power of directing the movements of the adjoining parts, acts like the brain of one of the lower animals ; the brain being seated within the anterior end of the body, receiving impressions from the sense organs, and directing the several movements
Seite 238 - ... while there are some forms which to some degree bear out expectations based on the general derivation hypothesis of structural development, there are quite as many which are altogether unexpected, and cannot be explained by that theory without invoking suppositions for which no facts can at present be adduced.
Seite 599 - ... place. He satisfied himself, by hundreds of experiments, that if he exposed to light the greater part of a nest, but left any part of it covered over, the young would certainly be conveyed to the dark portion. In this manner he satisfied himself that the different rays of the spectrum act on them in a different manner from that in which they affect us ; for instance, that ants are specially sensitive to the violet rays. But he was anxious to go beyond this, and to attempt to determine how far...