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action adipose tissue altered arrangement arteries become blood corpuscles body bone tissue calcareous canaliculi capillary vessels cartilage cell wall changes cilium composed connective tissue consists contractile tissue cuticle dark-bordered fibres delicate demonstrated dentine deposition diameter DISTRIBUTION OF NERVES early period elementary enamel epithelial epithelium exhibit existence fact fatty matter fibrous tissue fluid formation formed material frog fully formed glands globules gradually grow growth Haversian Haversian canal Haversian system higher animals increase intercellular substance kind lacuna living matter masses of bioplasm matrix medullary membrane membrane MICROSCOPICAL minute movements muscular fibre cells muscular tissue nerve cells nerve centres nerve fibres nerve-fibres nervous system nuclei nucleoli nutrient matter observed occur organs osseous tissue oval masses pabulum particles pass perichondrium period of development periosteum peripheral plasm Plate portion produced protoplasm removed sarcolemma seen soft specimens striped muscle structure surface takes place terminal texture tion transparent tubes undergoes
Page 347 - HOW TO WORK WITH THE MICROSCOPE. Fourth Edition, containing 400 Illustrations, many of them colored. Octavo. Price This work is a complete manual of microscopical manipulation, and contains a full description of many new processes of investigation, with directions for examining objects under the highest powers, and for taking photographs of microscopic objects.
Page 105 - In vertebrata, however, there is not an organ in the adult but retains not only the form which it assumed at a comparatively early period, but some of the very same structure that •was active in early life remains in an altered and deteriorated state. Every adult organ may be said to contain as it were the imperfect skeletons of organs which were active at an earlier period of life. This material, which slowly accumulates, clogs and perhaps, even in the most perfect state of things, slightly interferes...
Page 3 - ... far as they form a pabulum more easily assimilated by some organised beings. On this subject Dr. Beale is entirely in accord with Fletcher, and his frequently repeated and strong expressions must be familiar to almost every one. I may, however, quote this sentence from the Oxford lectures of 1869 : "Between the living state of matter and its non-living state there is an absolute and irreconcilable difference ; that, so far from our being able to demonstrate that the non-living passes by gradations...
Page 50 - One characteristic of every kind of living matter is spontaneous movement. This, unlike the movement of any kind of non-living matter yet discovered, occurs in all directions, and seems to depend upon changes in the matter itself rather than upon impulses communicated to the particles from without.
Page 21 - The rootlets of the plant extend themselves into the soil because the living matter at their extremities moves onward from the point already reached. The tree grows upward against gravity by virtue of the same living power of bioplasm. In every bud portions of this living matter tend to move away from the spot where they were produced, and stretch upward or onward in advance. No tissue of any living animal could be formed unless the portions of bioplasm moved away from one another.
Page 44 - J ounce ; Price's glycerin, 2 ounces ; distilled water, 2 ounces. Every kind of living or •germinal matter or bioplasm receives and fixes the color of this fluid, while no kind of formed material known is stained under the same circumstances.
Page 70 - However much organisms and their tissues in their fully formed state may vary as regards the character, properties, and composition of the formed material, all were first in the condition of clear, transparent, structureless, formless living matter.
Page 173 - I consider that numerous specimens I have made fully justify me in maintaining the general proposition that in all cases the terminal distribution of nerves is a plexus, network, or a loop, and hence that in connection with every terminal nervous apparatus, there must be at least two fibres, and that in all cases there exist complete, circuits, into the formation of which central nerve-cells, peripheral nerve- cells, and nerve-fibres enter. All these elements are in structural connection with each...
Page 267 - The plexus or network constituting the nerve tuft is not terminal, nor does it result from the branching of a single fibre, as has been represented. Many fibres enter into its formation ; and from various parts of it long, fine fibres pass off to be distributed upon the surface of the sarcolemma.
Page 249 - ... nerve-fibres in voluntary muscle. It is a matter of regret to me that although I have studied the question in many ways during the last five years, my conclusions do not accord with those of any other observer. And I must admit that although the German writers differ from one another on not unimportant points, they, nevertheless, agree in this, that the nerves form ends, pass into end-organs, or exhibit terminal extremities of some kind ; while on the other hand my observations have led me to...