Page:Response in the Living and Non-Living.djvu/139

Rh of the positive effect. (b) The amplitude of vibration of is now slightly reduced, and we obtain the diphasic effect. (c) The intensity of vibration of 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).

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