354 PHYSICAL PROPERTIES 



(126) Voigtlander, F., Zeit. f. physik. Chem., 3 (1889), p. 316. 



(127) Walden, P., Zeit. f. physik. Chem., 55 (1906), p. 209. 



(128) Weber, C. O., "The Chemistry of India-Rubber," London (1909), 



p. 80. 



(129) Wetham, W. C. D., Phil. Trans. Roy. Soc. London, 184A (1893), 



p. 337. 



(130) Wetham, W. C. D., Phil. Trans. Roy. Soc. London, 186A (1895), 



p. 507. 



(131) von Wittich, Arch. f. d. ges. Physiol. 7 (1873), p. 18, 8 (1874), p. 444. 



(132) Wood, T. B., and Hardy, W. B., Proc. Roy. Soc. London, 81B (1909), 



p. 38. 



(133) Zahn, F. W., Arch. f. d. ges. physiol., 2 (1870), p. 598. 



(134) Zlobicki, L., Bull. Acad. Sc. Cracovie Juli (1906), p. 488, cited after 



Wo. Ostwald (80), p. 225. 



(135) Zsigmondy, R., Zur Erkenntnis der Kolloide, Jena (1905). 



