of the positive effect. (b) The amplitude of vibration of b is now slightly reduced, and we obtain the diphasic effect. (c) The intensity of vibration of b is diminished still further, and the negative effect is seen reduced to a slight downward after-vibration, the positive up-curve being now very prominent (fig. 67).
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Fig. 67.—Negative, Diphasic, and Positive Resultant Response
Continuous transformation from negative to positive
I have shown the three phases of transformation, the intensity of one of the constituent responses being varied by altering the intensity of disturbance.
In the following record (fig. 68) I succeeded in obtaining a continuous transformation from positive to negative phase by a continuous change in the relative sensitiveness of the two contacts.
I found that traces of after-effect due to the application of Na₂CO₃; remain for a time. If the reagent is previously applied to an area and the traces of the
