Quarterly Journal of Microscopical Science, Band 10J. and A. Churchill, 1870 |
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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 described deutoplasm diameter distinct Edouard Van Beneden embryo epithelium exhibited fact fibres figure fluid formation frog frustules genus germinal matter germinal vesicle germs gland glass granular granules Greef Gregarina Gromia Hæmoglobin histology inch inflammation injection inner Journ lamina layer lens living matter lymphatic 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 spines sponge stomata structure substance surface tendons tion Trans Trematods tube vascular vesicle vessels white blood-corpuscles
Beliebte Passagen
Seite 339 - Is the case in any way changed when carbonic acid, water, and ammonia disappear, and in their place, under the influence of preexisting living protoplasm, an equivalent weight of the matter of life makes its appearance?
Seite 393 - 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...
Seite 416 - 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.
Seite 416 - ... 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.
Seite 394 - I. That these images, possessing extraordinary characters, exist principally above or below the best focal point, according as the objective spherical aberration is positive or negative. II. That test-images may be formed of a high order of delicacy and accurate portraiture in miniature, by employing an objective of twice the focal depth, or, rather, half the focal length, of the observing objective. III. That such test-images (which may be obtained conveniently two thousand times less than a known...
Seite 416 - 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...
Seite 219 - ... derived from pre-existing germinal matter. After a time some of these cease to multiply, though they still live and take up food. The living matter of which they are composed undergoes change. It dies under certain conditions, and tissue results. In this way muscle, and nerve, and fibrous tissue, and bone, and hair, and horn, and nail, and all the other tissues, are formed.
Seite 415 - 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.
Seite 210 - ... its formative properties. In the formation of man and the higher vertebrata the primary mass of bioplasm or living matter absorbs nutriment, and grows, and then divides and subdivides into numerous masses, which are arranged in a definite manner, but what determines this is not known. From each of these in pre-ordained order, and with perfect regularity, more are produced, no doubt, according to
Seite 418 - 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,...