[152] See the history given in Stilling’s learned work, Ueber den Bau der Nervenprimitiv-Faser, p. 34; and compare Max Shultze, De Retinæ Structura, p. 8, and Bau der Nasenschleimhaut, p. 66; Waldeyer, in the Zeitschrift für rat. Med., 1863; Lister and Turner, Observations on the Structure of Nerve-Fibres, in Quarterly Micros. Journal, 1859; Ranvier, in the Archives de Physiologie, 1872.
[153] Virchow’s Archiv, Bd. LXXII. p. 193.
[154] Monthly Journal of Micros. Science, 1874, XI. p. 214.
[155] Babuchin, Centralblatt, 1868, p. 756.
[156] Even so eminent an authority as W. Krause holds this both with regard to the varicose aspect and the double contour: Handbuch der menschlichen Anatomie, 1876, I. 367. Butschli, however, describes the nerves in a living Nematode as varicose: Archiv für Anat., 1873, p. 78; and I have somewhere met with an observation of the double contour being visible in the living animal.
[157] Butzke, Archiv für Psychiatrie, 1872, p. 594, states that the granular substance has the chemical composition of myeline. If this be so, we may suppose the “fibrils of crystallization” to represent the coagulation of the substance which is in solution amid the myeline granules, and corresponds with the axis cylinder of a fibre. I may remark that in almost every good preparation nerve-cells will be found in which, while one process is distinctly granular, another is striated or even fibrillated.
[158] Boll, Die Histiologie und Histiogenese der nervösen Centralorgane, in the Archiv für Psychiatrie, 1873, p. 47.
[159] Stieda, Studien über das Centralnervensystem der Vögel, 1868, p. 65. Mauthner, Op. cit., p. 4.
[160] Turner and Lister, Op. cit., p. 8.
[161] Blessig, De Retinæ Structura, 1857.