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UNIVERSITY OF MISSOURI STUDIES 



horizontal coordinate of the new figure, whatever its elevation in 

 the original curve may be, since every reversal of the movement of 

 the stirrup causes at once a movement of the parts of the parti- 

 tion next to the windows and only later a movement of the follow- 

 ing parts. So we continue transplanting each section of the 

 curve, alternately upright and upside down. This figure (Fig. 12) 



Tone i 



Tone 2 



Tone 3 



Figure 12. The combination 2 and 3. First characteristic 

 phase- (A is identical with G.) Compare figure 11 



is to be interpreted in the same way as figure 10. The distances 

 from x a to x lt x, to x„, and x, to x 3 represent three pieces 

 of the partition, x o being next to the windows. During the 

 unit of time, which is here the period from A to G, all the 

 nerve ends located between x and x receive, as is easily 

 seen, three shocks, counting the number of shocks received 

 by the number of downs (or ups, since this distinction between 

 the physiologically effective and ineffective direction of jerk- 

 ing is arbitrary, for want of better knowledge as to the man- 

 ner of excitation of the nerve ends). All the nerve ends be- 

 tween x\ and x^ receive, as the figure shows, counting from 

 left to right, two shocks in the unit of time. And all the 



