218 LIGHT AND PROTOPLASM [Cn. VII 



WARD, H. M. '93 a . Further Experiments on the Action of Light on Bacillus 



anthracis. Proc. Roy. Soc. LIII, 23-44. 

 '94. The Action of Light on Bacteria. III. Proc. Roy. Soc. LIV, 



472-475. 

 '94 a . Further Experiments on the Action of Light on Bacillus anthracis 



and on the Bacteria of the Thames. Proc. Roy. Soc. LVI, 315-394. 

 WETTSTEIN, R. v. '85. Untersuchungen iiber einen neuen pflanzlichen 



Parasiten des menschlichen Kb'rpers. Sb. K. Akad. wiss. Wien. XCI, 



1 Abth., 33-58. 

 WILLEM, V. '91. La vision chez les Gastropodes pulmones. Comp. Rend. 



CXII, 247, 248. 26 Jan. 1891. 



WILSON, E. B. '91. The Heliotropism of Hydra. Am. Nat. XXY, 413-433. 

 WINOGRADSKY, S. '87. Ueber Schwefelbacterien. Bot. Ztg. XLV, 489 et 



folg. Aug.-Sept. 1887. 

 YUNG, ]3. '78. Contributions a 1'histoire de 1'influence des milieux physiques 



sur les etres vivants. Arch, de Zool. VII, 251-282. 



