Quarterly Journal of Microscopical Science, Volume 10J. and A. Churchill, 1870 |
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Palavras e frases frequentes
Acanthocystis acid animal aperture appear Archer band beading become Beneden bioplasm blood body bundles capillaries cavity cellular central capsule ciliary ciliary muscle ciliary processes ciliated Claparède colour colourless connective tissue cornea corpuscles cyst described deutoplasm diameters distinct Edouard Van Beneden embryo epithelium exhibited fact fibres figure fluid formation frog frustules genus germinal matter germinal vesicle germs gland glass globular granular granules Greef Gregarina Gromia Hæmoglobin histology inch inflammation injection inner Journ lamina layer lens living matter lymphatic magnified mass membrane microscope minute muscle muscular nerve nucleolus nucleus object observed Opalina organism outer ovum paper particles plasm plasmatic plate portion posterior present produced Professor protoplasm pseudopodia Radiolaria rays regard remarkable Rhizopoda sarcode seen sheath solution species specimens spicules sponge stomata structure substance surface tendons tion Trans Trematods tube vascular vessels white blood-corpuscles
Passagens conhecidas
Página 193 - I propose to give to the living or germinal selfincreasing matter of living beings, and to restrict to this, is Bioplasm. Now that the word Biology has come into common use, it seems desirable to employ the same root in designating the matter which it is the main purpose of biology to investigate. Bioplasm involves no theory as regards the nature or the origin of the matter ; it simply distinguishes it as living. A living white blood-corpuscle is a mass of bioplasm, or it might be termed bioplast....
Página 371 - Searcher is intended to improve the penetration, amplify magnifying-power, intensify definition, and raise the objective somewhat further from its dangerous proximity to the delicate covering-glass indispensable to the observation of objects under very high powers. The inquiry into the practicability of improving the performance of microscopic object-glasses of the very finest known quality was suggested by an accidental resolution in 1862 of the Podura markings into black beads. This led to a search...
Página 390 - ... permutations and combinations. It is in this region that the poles of the atoms are arranged, that tendency is given to their powers, so that when these poles and powers have free action and proper stimulus in a suitable environment, they determine first the germ and afterwards the complete organism.
Página 390 - Through pure excess of complexity, and long before observation can have any voice in the matter, the most highly trained intellect, the most refined and disciplined imagination, retires in bewilderment from the contemplation of the problem. We are struck dumb by an astonishment which no microscope can relieve, doubting not only the power of our instrument, but even whether we ourselves possess the intellectual elements which will ever enable us to grapple with the ultimate structural energies of...
Página 267 - To students attending classes in our Universities and elsewhere, to those working in their own studies, to all interested in any branch of Comparative Anatomy, we most earnestly, and with the confidence which comes of experience, commend "Forms of Animal Life" as a thorough piece of work, and certainly the best book on Comparative Anatomy in our language.
Página 389 - When, for example, the contents of a cell are described as perfectly homogeneous, as absolutely structureless, because the microscope fails to distinguish any structure, then I think the microscope begins to play a mischievous part.
Página 390 - Have the diamond, the amethyst, and the countless other crystals formed in the laboratories of nature and of man no structure ? Assuredly they have ; but what can the microscope make of it ? Nothing. It cannot be too distinctly borne in mind that between the microscopic limit, and the true molecular limit, there is room for infinite permutations and combinations.
Página 372 - The appendix refers to plates illustrating the mechanical arrangements for the discrimination of eidola and true images, and for traversing the lenses of the aplanatic searcher. The plates also show the course of the optical pencils, spurious disks of residuary aberration and imperfect definition, as well as some examples of
Página 392 - In both the ingredient minerals are minute, and are often, especially in the case of the aerolitic rock, very imperfectly crystallized. Moreover the methods for separating them, whether mechanically or chemically, are very incomplete. With a view to obtain some more satisfactory means of dealing with these aggregates of mixed and minute minerals, I sought the aid of the microscope, by having in the first place sections of small fragments cut from the meteorites so as to be transparent. One may learn,...
Página 290 - Silene acaulis is but half the size of that of 8. alpina, the latter having some beautiful markings in addition; the pollen grains of this genus differ from the usual caryophyllaceous type in not having the pits or depressions common in the order, so that the grains become spherical rather than polyhedral. 4. COLOUR. This is not so reliable a character for differentiation as the others noticed, since species differ amongst each other according to the soil, &c., of the place where they have grown.