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tion, the first curvature 

 cli is fixed with unusual 



lieve that there is here a coml; 

 being due to a turgor change, 1 

 promptness by growth. 



The movements of minute motile organisms, whether 

 autonomous or induced, can hardly be analyzed, so inti- 

 mate are the relations of the primary and secondary 

 phases of response, if indeed they are separable. 



All physiological responses when analyzed show the 

 same general relations, no matter how varied the stimuli 

 and the end reactions. If there were nothing more than 

 the general applicability of Weber's law, this would be 

 enough to suggest that there is some fundamental unity 

 in the responses. There are, however, many other fea- 

 tures that point in the same direction. It is obvious that 

 the common factor is not to be found in the later phases 

 of the response, where the structure of the organ may 

 play a determinative role; nor in the direction from which 

 the stimulus acts, which is known to determine often the 

 direction of movement. Bose has sought to show that all 

 cells when stimulated exhibit two concomitant responses, 

 by which, it seems, he would account for all the phenom- 

 ena of plant life, even to the ascent of water! Without 

 assenting to his applications of the observations, we must 

 say that Bose has done good service in showing that a 

 mechanical contraction follows stimulation, and that 

 change in electric potential occurs simultaneously. This, 

 T think, we may consider established for a large number 

 of plants, and it is very likely true of all. A study of the 



the dark i 



