Sur la présence des fibres elastiques dans les crachats des phthisiques comme signe certain d'une vomique / par J. L. C. Schroeder van der Kolk ; traduit du Hollandais par le Dr. Ploem.

  • Schröder van der Kolk, Jacob Lodewijk Koenraad, 1797-1862.
Date:
1850
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Licence: Public Domain Mark

Credit: Sur la présence des fibres elastiques dans les crachats des phthisiques comme signe certain d'une vomique / par J. L. C. Schroeder van der Kolk ; traduit du Hollandais par le Dr. Ploem. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    We shall next proceed to the considération of some of tlie more récent contributions to normal histology. Development of the Anatomical Eléments in General. The follow- ing table has been constructed by M. Robin, to show the several relations existing between cells, which he considers the most simple, and least animal éléments. 1. In the Ovum. Eléments of transitory tissues or emhryonal cells., formed by segmentation of the vitellus, whence results the birth of the embryo, and which terminate A. In Vegetables. Ail by direct metamorphosis into éléments of definite tissues, persisting thus in the state of cellule during the entire existence of the being. B. Amongst Animais, a. Tliose of the superficial layer of the serons lamina of the blastoderma solely become metamorphosed, after the manner of vegetable cells, into éléments of products (cells of the amnios, epithelial cells, &c). h. Ail other embryoual cells terminate by dissolution. 2. In the Tissues of the fuUy formed Being. Eléments of tissues which persist during the entire life of the individual, whence re- sults its growth. They grow: A. In Vegetables. In the state of cellules, being formed by germi- nation, and undergoing metamorphosis as in the embryo. They terminate at the death of the being, or by reabsorption during life. B. In Animais, a. The éléments o'îproducts (epithelium, &c.) grow in the state of cells, undergoing a direct metamorphosis into horn, nails, and other products, in a manner similar to ail cor- responding embryonal animal cells and ail vegetable cells. They terminate by desiccation, and fall off only at death. b. The éléments of fundamental tissues (muscles, skin, &c.), or the tissues properly so called, grow without passing through the state of cell, and without undergoing metamorphosis; they grow in the blastema resulting from the dissolution of embryo- nal cells, or in that which transudes from the vessels. They ter- minate either in death or résorption. The formation of a nucleus on a pre-existing nucleolus is, accord- ing to Giinsburg, a very rare occurrence. The nucleoli appear for the first time in the nuclei, after the action of acetic acid; and their independent origin first takes place with the formation of the cell from the nucleus. The well-known granular appearance of animal cells is first observed, as Kolliker remarks, on the addition of water; in their récent condition, the most of them contain, in- stead of a nucleolus, only a clear fluid. Kramer considers the nu- cleus of the blood-corpuscles of the frog to originate in the finely granular residue of the cell-contents, the yolk-granules, which collect together in a heap in the middle of the cell, and thus melt down into the clear-cdged nucleus. From this author's history of the development of the frog, and the embryo, Henlé doduces the following interesting observations on ccll-genesis in gênerai. The
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