270 RALPH S. LILLIE AND EARL N. JOHNSTON. 



DESCRIPTION OF PLATE V. 



FIG. 22. Fe-ferricyanide growths, showing the acceleration caused by making 

 metal anodic while the structures are forming. 



FIG. 23. An iron wire in a ferricyanide solution showing cathodic inhibition 

 of precipitation formations. The round objects are hydrogen bubbles. 



FIG. 24. Filaments showing modifications produced by passing a galvanic 

 current directly through the metal while the filaments are forming. The beaded 

 effect is produced by alternately making and breaking the current. 



FIG. 25. Same as Fig. 24. 



FIG. 26. Precipitation filaments from iron, showing enlargements at the ends 

 of the filaments produced by a sudden decrease in the concentration of the solution- 



FIG. 27. This shows the peculiar manner in which large Fe-ferricyanide fila- 

 ments break down after a sudden lowering of the concentration of the surrounding 

 solution. 



