Note 141 — Chapter VII · THE ELEMENTARY STRUCTURE OF THE NERVOUS SYSTEM.

Haeckel, Müller’s Archiv, 1857. Leydig, Vom Bau des thierischen Körpers, 1864, I. 84. Robin, Anat. et Physiol. Cellulaires, p. 89. Should the observations of Heitzmann be confirmed, there would be ground for believing that neurine is normally fibrillated. He says that the living protoplasm in the Amœba, white blood-corpuscle, etc., is an excessively fine network, which condenses into granules at each contraction. (Cited in the Jahresberichte über Anat. und Physiol., 1873, Bd. II.) Walther, who examined frozen brains, describes the cells as quite transparent at first, with very rare granules, but gradually while under observation the granules became more numerous. Centralblatt, 1868, p. 459. According to Mauthner, Beiträge zur Kenntniss der morphologischen Elemente des Nervensystems, 1862, p. 41, neurine has three cardinal forms—transparent, finely granular, and coarsely granular.