322 The Electrical Reactions of certain Bacteria, etc. 



phenylene-di-amine, sulphanilic acid, picric acid, carbol fuchsin, chloroform, 

 carbolic acid, acetic acid, and acetamide. 



[Note. — Since completing these experiments I have searched the literature 

 of the subject with the following results : — 



Abbot and Life (' American Journ. Physiol.,' 1908, p. 202) tested micro- 

 scopic quantities of motile bacteria suspended in distilled water, and 

 observed to-and-fro movements in a glass trough. They used excessively 

 minute currents, and concluded that variations in the observed reactions of 

 the organisms depended upon their cultivation in acid or alkaline media. 

 They found no effects with dead or nou-motile (living) species ; they avoided 

 currents large enough to cause electrolysis, and concluded that their results 

 were galvanotropic. 



Apostoli and Laquerriere (' Compt. Bend.,' 1901, vol. 133, p. 186) con- 

 cluded that constant currents are able to sterilise cultures or attenuate their 

 virulence. They studied especially the conditions necessary to produce such 

 effects. 



S. Kriiger, " Ueber den Einfluss des constanten electrischen Stromes auf 

 Wachsthum und Virulenz der Bacterien " (' Zeitschrift fur Klinische 

 Medicin,' 1893), contributes an account of the lethal effects of electricity 

 applied to bacteria. 



Other references are appended to papers I have not yet been able to 

 consult, viz. : — 



Friedenthal, H. " Ueber den Einfluss des elektrischen Stromes auf 

 Bakterien," ' Centralblatt f. Bakteriol.,' 1. Abt., Jena, 1896 (vol. 19, pp. 319— 

 324) ; " Ueber den Einfluss der Inductions-Electricitat auf Bacterien," 

 ibid. (vol. 20, p. 505). 



Jennings, H. S. Papers on reactions to electricity in unicellular organisms. 

 ' J. Comp. Neurol, and Psychol.,' Granville, vol. 15, 1905, 528—534. 



Bang, S. " Wirkungen des elektrischen Bogenlichtes auf Tuberkel- 

 bazillen in Bein-Kultur," ' Mitt. Einsens Lysinst. Kopenhagen,' Leipzig, 

 EL 3, 1903 (97—112).] 



