215 On various theories of the mechanism of mitosis, see (e.g.) Wilson, The Cell in Development, etc., pp. 100ã114; Meves, Zelltheilung, in Merkel u. Bonnetãs Ergebnisse der Anatomie, etc., VII, VIII, 1897ã8; Ida H. Hyde, Amer. Journ. of Physiol. XII, pp. 241ã275, 1905; and especially Prenant, A., Theories et interprûˋtations physiques de la mitose, J. de lãAnat. et Physiol. XLVI, pp. 511ã578, 1910.
216 Hartog, M., Une force nouvelle: le mitokinûˋtisme, C.R. 11 Juli, 1910; Mitokinetism in the Mitotic Spindle and in the Polyasters, Arch. f. Entw. Mech. XXVII, pp. 141ã145, 1909; cf. ibid. XL, pp. 33ã64, 1914. Cf. also Hartogãs papers in Proc. R. S. (B), LXXVI, 1905; Science Progress (n. s.), I, 1907; Riv. di Scienza, II, 1908; C. R. Assoc. fr. pour lãAvancem. des Sc. 1914, etc.
217 The conôÙfiôÙgurôÙaôÙtions, as obtained by the usual experimental methods, were of course known long before Faradayãs day, and constituted the ãconvergent and divergent magnetic curvesã of eighteenth century mathematicians. As Leslie said, in 1821, they were ãregarded with wonder by a certain class of dreaming philosophers, who did not hesitate to consider them as the actual traces of an invisible fluid, perpetually circulating between the poles of the magnet.ã Faradayãs great advance was to interpret them as indications of stress in a medium,ãof tension or attraction along the lines, and of repulsion transverse to the lines, of the diagram.