GALVANOTROPISM OF TADPOLES. 103 



galvanic bath such as this, containing a mixture of ciliated 

 and flagellated protozoa. In the absence of any electrical 

 current they are swimming about in all directions, inter- 

 mingling in the most friendly manner. Make the current 

 and two armies, so to speak, assemble themselves on the 

 two banks ; ciliata to the kathode, rlagellata to the anode ! 

 appears to have been their mot <f ordre ; and now if you 

 reverse the current the two armies put themselves in motion 

 and appear as if precipitating themselves upon each other, 

 but no disaster happens, the opposing crowds slip through 

 each other and reassemble at the pole which they respec- 

 tively affect. 



BIBLIOGRAPHY. 



VERWORN. Pfliiger's Archiv, vol. xlv., xlvi., 1889-90. 

 Hermann. P finger's Archiv, vol. xxxvii., p. 457, 1885 ; vol. 

 xxxix., p. 414, 1886. 



BLASIUS and SCHWEIZER. P fiiiger's Archiv, vol. liii. 

 NEIGEL. P finger's Archiv, vol. li., p. 624 ; vol. liii., p. 332. 

 HERMANN and Mathias. Pfliiger's Archiv, vol. lvii., p. 391, 



1894 ; cbt. ix., 66. 

 BLASIUS and SCHWEIZER. P fiiiger s Archiv, vol. liii., p. 493. 

 EWALD. Pfliiger's Archiv, vol. lv., p. 616; vol. lvi., p. 354; cbt. 



viii., 663. 

 EWALD. Pfliiger's Archiv, cbt., vol. viii., p. 663. 

 LUDLOFF. Pfliiger's Archiv, vol. lix., p. 525. 



Augustus Waller. 



