LITERATURE 153 



XAGEL, W. A. '95. Ueber Galvanotaxis. Arch, f . d. ges. Physiol. LIX, 603- 



642. 5 Feb. 1895. 

 OSTWALD, W. '94. Manual of Physico-chemical Measurements. Translated 



by J. Walker. 255 pp. London : Macmillan. 1894. 

 VERWORX, M. '89*. Die polare Erregung der Protisten durch den galva- 



nischen Strom. Arch. f. d. ges. Physiol. XLV, pp. 1-36. 23 March, 



1889. 

 '89 b . The same (continued). Arch. f. d. ges. Physiol. XL VI, pp. 267- 



303. 18 Xov. 1889. 

 '95. (See Chapter IV.) 

 WALLER, A. D. '95. Galvanotropism of Tadpoles. Science Progress. IV, 



96-103. Oct. 1895. 



