On fibre / [M. Barry].

  • Barry, M. (Martin), 1802-1855
Date:
1842
Catalogue details

Licence: Public Domain Mark

Credit: On fibre / [M. Barry]. Source: Wellcome Collection.

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    apply themselves to one another (fig. 28), so as to present the appearance of a neek- lace ; and that subsequently, as the partitions between the cell-cavities are absorbed, this necklace becomes a tube. It is supposed that the ultimate threads of the tissue arise within this tube. But on the subject of the particular mode of origin of these ultimate threads, I am not aware that we possess any published information, except that furnished by Schwann and Valentin : the former having shown that a “ secon- dary deposit” makes its appearance on the inner surface of the wall of the tube-|', and the latter, that this deposit soon presents longitudinal threads; which threads have sometimes the appearance of being composed of longitudinal rows of globules:}:.” I do not find that any mention has hitherto been made of a second order of tubes, arising within the first or parent tube (par. 42). The results obtained by myself are by no means complete ; but may perhaps afford information that will serve as a guide in future investigations. 21. Cells applied to one another in the above necklace-like manner, I formerly showed to become filled with discsIf now fig. 26 y be referred to, such discs—or cells into which the discs have passed—will be seen arranged in lines, corresponding with the direction of the forming tube. This figure was taken from the mould of cheese. Fig. 36 presents an arrangement of the same kind, noticed in voluntary muscle. 22. One of the purposes for which this linear direction occurs, seems to be the pro- duction of smaller tubes within the larger one (fig. 30); and another purpose is ap- parently a peculiar arrangement of discs within the smaller tube. Such an arrange- ment is seen in figs. 45 to 48. In some of these, the discs had become rings. The structure of these rings was such as to leave no doubt with me, that the same process was in operation as that producing the changes, above described, in corpuscles of the blood. The blood-corpuscle (fig. 17 «,) passes from a mere disc into a ring (j3, y), and this ring into a coil (^, s, s). Now, with the regular arrangement of rings seen at a fig. 48, and with the analogy of the blood-corpuscles just mentioned, it seems highly probable that every ring (fig. 48 a) becomes a coil, and that the extremities of coils in the same line unite, to form a spiral. I have to add, that a spiral (y) actually existed in this tube (fig. 48) in a line with the rings represented in the figure, having obviously been formed out of such rings: and I know of no way in which the transformation could have been effected so easily and so naturally as that now described. 23. The tube in question (fig. 48) presents, not merely one, but two spirals: and these two spirals interlace with one another. This interlacement seems to explain t Schwann, “ Mikroskopische Untersuchungen iiber die Uebereinstimmung in der Struktur und dem Wachsthum der ^Fhiere und Pflanzen.” Tab. IV. fig. 3. \ Valentin, in Muller’s Archiv, 1840, p. 204. My observations,are entirely difl'erent from those of Valentin as to the office performed by the nueleus of the cell. § “ On the Corpuscles of the Blood,” Part III., /. c., par. 161.