INORGANIC RESPONSE 



of restitution. The response-curve thus rises to its 

 maximum, after which the deflection is held as it were 

 rigid, so long as the vibration is kept up. 



It was found that increasing intensities of single 

 stimuli produced correspondingly increased responses. 

 The same is true also of groups of stimuli. The maximum 



ao 



3 



40" 



60' 



100 



FIG. 87. CYCLIC CURVE FOK MAXIMUM EFFECTS SHOWING HYSTERESIS 



effect produced by superposition of stimuli increases 

 with the intensity of the constituent stimuli. 



Hysteresis. Allusion has already been made to 

 the increased responsiveness conferred by preliminary 

 stimulation (see p. 127). Being desirous of finding out 

 in what manner this is brought about, I took a series 



