326 A. A. SCHAEFFER. 



7. The experiments indicate that ameba is sensible to at least 

 two kinds of stimulation: that from insoluble solids such as 

 carbon and glass, and that from substances in solution, such as 

 peptone or albumin. It seems hardly possible that carbon and 

 glass, at a distance from the ameba, produce the same disturbance 

 on the surface of the ameba, such as a change in surface tension, 

 as contact with dissolved peptone. A definite conclusion how- 

 ever awaits further work. 



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