WM. A. KEENER AND W. H. TALIAFERRO. 



November 30, 1911. A specimen that had been in the labora- 

 tory nineteen hours came in contact with the drop of .05 per cent, 

 salt solution six times and each time it reacted by turning away 

 from the margin of the salt solution (text-figure 6-c\ 



FIG. 6. Diagrams indicating the paths of specimens when placed in fresh water 

 and encountering a drop of .05 per cent, salt solution. The dotted line indicates 

 the contour of the drop of .05 per cent, salt solution surrounded by fresh water. 



None of these specimens so treated entered the salt solution. 



Group i-& (specimens placed in .05 per cent, salt solution and 

 allowed to encounter a drop of fresh water). 



January 9, 1912. A specimen that had been in the laboratory 

 seventeen hours. This one was caught in the drop of fresh water 

 as the water was issuing from the pipette. Although it came 

 in contact with the margin of the salt solution six times it did 

 not leave the fresh water as shown by text-figure 7 -a. 



FIG. 7. Diagrams indicating the paths of specimens when placed in .05 per cent, 

 salt solution and encountering a drop of fresh water. The dotted line indicates the 

 contour of the drop of fresh water surrounded by .05 per cent, salt solution. 



