Remarks on Quekett's Histology, On Kölliker's Human histology, and on the physiological importance of the nucleus of the cell / by Martin Barry, M.D.

  • Barry, M. (Martin), 1802-1855.
Date:
[1854]
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Licence: Public Domain Mark

Credit: Remarks on Quekett's Histology, On Kölliker's Human histology, and on the physiological importance of the nucleus of the cell / by Martin Barry, M.D. 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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    with his fig. 84 A. The spirals there seen I apprehend to have arisen from the union of many coils, each coil an altered nucleus. 9. Sometimes fibre given off by the nucleus of a cell is met with, simply deposited upon the inner surface of the cell wall.—Phil. Trans. 1842. Plate V., figs. 8 to 12. Compare with Quekett's fig. 84 A, of a short spiral vessel. And what a display of fibre, given off, as I believe, by a nucleus, is seen in his drawings of fibro-cellular tissue, figs. 61 and 62. It would seem that here, as the nucleus gives off fibre, what is left of the nu- cleus continues parietal to the last, and that it entirely exhausts itself in tlie formation of one long spiral fibre, the end of which (see the figure) denotes the position of what was the nucleolus. 10. Fibre given off by the nucleus of the cell sometimes thickens the cell-wall.—Plate X., figs. 133, 134, 136, from cartilage of the ear.— Phil. Trans. 1842. Compai-e with Quekett's figs. 124 and 127 6, from an enchon- droma. Compare with many figures given by Kolliker. For instance, with that of the cells of cartilage from the epiglottis, fig. 21; with that of cells of the ligamentoiis discs of the bodies of the vertebrae, fig. 122, described as representing concentrically thickened walls and shrunken nuclei; with that of cells of costal cartilage, fig. 124 c; and with that of cells in rachitic bone, fig. 132. When fibre is simply deposited upon the inner surface of the cell-wall, it represents, as it were, a commencement of the thick- ening. Compare this remark, and my figures of 1842, with the following by Schacht in 1853 :— The increase in thickness of the cell appears to arise from the deposit of solid substance in the interior, upon the original cellulose of the cell-wall. This deposit of new matter fre- quently appears to take place in the form of a spiral; in very young wood-cells, for instance, in the youngest cells of a fresh twig of pinus abies, a most delicate spiral band may be observed in spring and in summer; in the older cells it can hardly be perceived. The band which is seen in spiral cellular tissue, the markings in the thick- ening layers of the liber-cells of vinca minor, the arrangement of those spots the thickness of which is less than that of the rest of the cell, and which occur in the thickening substance of the wood-cells of caryota lu'ens and hemardia sonora, as Avell as the disposition of the slit-shaped pores of many wood-cells (those of cycas, for example), all afford arguments in favour of the thickening substance being deposited in the form of a spiral.^ Farther, compare these remarks by Schacht in 1853, with the ' The Microscope in its special application to Vegetable Anatomy and Pliy- Molofry. By Dr Hermann Schacht. Translated by F. Currey, Esq., M A. London : Highley. 1863. Pp. 33, 34.