The Scientific Memoirs of Thomas Henry Huxley, Volume 1Macmillan and Company, limited, 1898 |
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The Scientific Memoirs of Thomas Henry Huxley, Volume 1 Thomas Henry Huxley Visualização completa - 1903 |
The Scientific Memoirs of Thomas Henry Huxley, Volume 1 Thomas Henry Huxley Visualização completa - 1898 |
The Scientific Memoirs of Thomas Henry Huxley, Volume 1 Thomas Henry Huxley Visualização completa - 1898 |
Termos e frases comuns
anatomy animal Annelid anus aperture appears appendage Appendicularia Ascidians attached auditory axis band becomes body bone branchial buccal calcareous canal capsule cartilage cavity cells Cephalaspis cephalic ciliated composed connected consists contained corpuscles corresponding cyst delicate dentine described disc distinct dorsal ecderon Echinococci Echinoderm edge elongated enamel enamel organ endoplasts endostyle existence external extremity fact fibres ganglia ganglion genus germinal vesicle granular granules homologous inch in diameter inner integument intestine Kölliker Lacinularia laminæ larva larvæ latter layer mantle margin mass membrane Mollusca Mollusk mouth Müller muscular nerves nervous nucleus observed organs outer oval ovum papilla parietes peculiar pedicle periplastic substance Plate Polypes portion posterior present Prof Pteraspis pulp Pyrosoma resembling respiratory Rhizostoma Rotifera Salpa shell side similar skull species specimens spermatozoa stomach structure structureless surface tentacles terminates tissue transparent transverse tube tunic upper utricle vascular ventral Vertebrata vertebrate vesicle vessels wall water-vascular young
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Página 277 - They are no more the producers of vital phenomena than the shells scattered in orderly lines along the sea-beach are the instruments by which the gravitation - force of the moon acts upon the ocean. Like these, the cells mark only where the vital tides have been and how they have acted.
Página 268 - The periplast, on the other hand, under the names of cell-wall, contents, and intercellular substance, is the subject of all the most important metamorphic processes, whether morphological or chemical, in the animal and in the plant. By its differentiation, every variety of tissue is produced; and this differentiation is the result, not of any metabolic action of the endoplast, which has frequently disappeared before the metamorphosis begins, but of intimate molecular changes in its substance which...
Página 235 - Nasmyth's membrane" is identical, on the one hand, with the persistent capsule which lies external to both enamel and cement, and, upon the other hand, with the preformative membrane of Raschkow, or otherwise with the basement membrane of the pulp ; it is clear that all the tissues of the tooth are formed beneath the basement membrane of the pulp; in other words, they are all true dermic...
Página 311 - Thus in travelling from one end to the other of the scale of life, we are taught one lesson, that living nature is not a mechanism but a poem; not a mere rough engine-house for the due keeping of pleasure and pain machines, but a palace whose foundations, indeed, are laid on the strictest and safest mechanical principles, but whose superstructure is a manifestation of the highest and noblest art.
Página 352 - Noctiluques" published in the Annales des Sciences Nat. for 1850. M. de Ouatrefages does not admit the existence of any true mouth or intestinal canal, and considers that the so-called stomachs are nothing but 'vacuoles' similar to those observed in the Rhizopoda and Infusoria. In a short memoir published in Wiegmann's Archiv. for 1852,. however, that excellent and most accurate observer, M. Krohn, carried the subject a stage further, and showed that the organization of Noctiluca is more complex...
Página 352 - Noctiluca appear to push repeatedly against obstacles, with this tentacle. The body is composed of a structureless and somewhat dense external membrane, which is continued on to the tentacle. Beneath this is a layer of granules or rather a gelatinous membrane, through whose substance minute granules are scattered without any very definite arrangement. From hence arises a network of very delicate fibrils, whose meshes are not more than l-3000th of an inch in diameter (fig.
Página 11 - I would wish to lay particular stress upon the composition of this (the stomach) and other organs of the Medusae out of two distinct membranes, as I believe that it is one of the essential peculiarities of their structure, and that a knowledge of the fact is of great importance in investigating their homologies. I will call these two membranes as such, and independently of any modifications into particular organs,
Página 192 - This was in 1853. He further stated: " There is no progression from a lower to a higher type, but merely a more or less complete evolution of one type
Página 252 - In this semi-fluid mass cavities are now developed; these, if they remain round or polygonal, become the subsequent cells; if they elongate, the vessels; and the process is identically the same, whether it is examined in the vegetating point of a plant, or in the young budding organs of an animal.
Página 239 - The histological elements of the pulp take no direct part (except, perhaps, eventually in the cement) in the development of the dental tissues, becoming either absorbed or being pressed in by the gradual increase of the latter...