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Published online by Cambridge University Press: 22 March 2019
My main purpose in the following short paper is to publish figures illustrating some of the more important facts of the early development of myotomes and motor nerves in Lepidosiren. The bearing of some of the observations of nerve development upon current theories renders it particularly desirable that they should be illustrated by untouched photographs of the sections. A few photographs illustrating the more important stages in the development of the motor nerve trunks are given on Plate I. For the preparation of the photographs here published, as well as several others, I am indebted to the skill of my friend Dr T. H. Bryce, and of Mr Fingland, our University photographer.
page 119 note * By stage n I mean the stage represented by fig. n in my paper on the external features during development, Phil. Trans. Roy. Soc. B., vol. cxcii. p. 299.
page 119 note † Cf. Raffaele's fig. in Anat. Anz., 1900, p. 340 (Per la genesi dei nervi da catene cellulari). Cf. also Kolliker's remarks on this, op. cit., p. 511.
page 120 note * Here as elsewhere I use the word “cell” merely as a substitute for the more cumbrous expression “nucleated mass of protoplasm” without in the least implying that it is separate from its neighbours. As a matter of fact the “cells” of the mesenchyme are merely the enlarged and nucleated nodes of an irregular continuous protoplasmic spongework such as Sedgwick describes in Selachians.
page 121 note * Phil. Trans. B., vol. cxcii., pl. 10, fig. 24.
page 122 note * These have been printed as separate Plates—V. and VI.
page 123 note * Cf. Godlewski, , Arch. Mikr. Anat., Bd. lx., 1902 Google Scholar.
page 126 note * Were this the case, it might well be that the formation of fibrils might tend as a rule to spread from the end of the nerve from which came the most active and frequent nerve impulses.
page 126 note † Bethe, Allgemeine Anatomie and Physiologie des Nervensystems, p. 244
page 126 note ‡ Büngxer, Ziegler's Beiträge z. Path. Anat., Bd. x., 1891.
page 126 note § Wieting, op. cit., Bd. xxiii., 1898.
page 126 note ∥ This view of nerve regeneration, which my ontogenetic work inclines me towards, appears to agree most closely with that enunciated by Neumann (Arch. Path. Anat. u. Phys., Bd. clviii. p. 466).
page 126 note ¶ This protoplasmic strand within the protoplasmic sheath could only be demonstrated with extreme difficulty.
page 127 note * Op. cit., p. 238.
page 127 note † Much of the minute detail has unfortunately disappeared in the mechanical printing of these figures. I shall be glad therefore to show any specialists who are interested sun prints from the same negatives, in which the full detail is brought out.
