318 Cf. (int. al.) Lehmann, Ueber scheinbar lebende Kristalle und Myelinformen, Arch. f. Entw. Mech. XXVI, p. 483, 1908; Ann. d. Physik, XLIV, p. 969, 1914.
319 Cf. B. Moore and H. C. Roaf, On the Osmotic Equilibrium of the Red Blood Corpuscle, Biochem. Journal, III, p. 55, 1908.
320 For an attempt to explain the form of a blood-corpuscle by surface-tension alone, see Rice, Phil. Mag. Nov. 1914; but cf. Shorter, ibid. Jan. 1915.
321 Koltzoff, N. K., Studien û¥ber die Gestalt der Zelle, Arch. f. mikrosk. Anat. LXVII, pp. 364ã571, 1905; Biol. Centralbl. XXIII, pp. 680ã696, 1903, XXVI, pp. 854ã863, 1906; Arch. f. Zellforschung, II, pp. 1ã65, 1908, VII, pp. 344ã423, 1911; Anat. Anzeiger, XLI, pp. 183ã206, 1912.
322 Cf. supra, p. 129.
323 As Bethe points out (Zellgestalt, Plateausche Flû¥ssigkeitstigur und Neurofibrille, Anat. Anz. XL. p. 209, 1911), the spiral fibres of which Koltzoff speaks must lie in the surface, and not within the substance, of the cell whose conformation is affected by them.
CHAPTER VI A NOTE ON ADSORPTION
324 See for a further but still elementary account, Michaelis, Dynamics of Surfaces, 1914, p. 22 seq.; Macallum, OberflûÊchenspannung und Lebenserscheinungen, in Asher-Spiroãs Ergebnisse der Physiologie, XI, pp. 598ã658, 1911; see also W. W. Taylorãs Chemistry of Colloids, 1915, p. 221 seq., Wolfgang Ostwald, Grundriss der Kolloidchemie, 1909, and other text-books of physical chemistry; and Baylissãs Principles of General Physiology, pp. 54ã73, 1915.
325 The first instance of what we now call an adsorptive phenomenon was observed in soap-bubbles. Leidenfrost, in 1756, was aware that the outer layer of the bubble was covered by an ãoilyã layer. A hundred years later Duprûˋ shewed that in a soap-solution the soap tends to concentrate at the surface, so that the surface-tension of a very weak solution is very little different from that of a strong one (Thûˋorie mûˋcanique de la chaleur, 1869, p. 376; cf. Plateau, II, p. 100).