INORGANIC RESPONSE 



FIG. 84. A SECOND SET OF KECOKDS WITH A 

 DIFFERENT SPECIMEN OF TIN 



The amplitudes of vibration are increased by 

 steps of 10, from 20 to 160. (The deflec- 

 tions are reduced by interposing a high ex- 

 ternal resistance.) 



through a wider range. For accurate quantitative 

 measurements it is preferable to wait till the recovery 

 is complete. We 

 may accomplish this 

 within the limited 

 space of the record- 

 ing photographic 

 plate by making 

 the record for one 

 minute ; during the 

 rest of recovery, the 

 clockwork moving 

 the plate is stopped 

 and the galvano- 

 meter spot of light 

 is cut off. Thus the 

 next record starts from a point of completed recovery, 

 which will be noticed as a bright spot at the beginning 

 of each curve. With stimulation of high intensity, a 



tendency will be noticed for 

 the responses to approach a 

 limit. 



Threshold of response.-- 

 There is a minimum intensity 

 of stimulus below which there 

 Fm * 85 '~N E o C N N SUPERPOSI ; is hardly any visible response. 



A ^S^!: We ma y re g ard tllis p int as 



s^rurproduce^th'e succeeding the threshold of response. 



stronger responses. ' Though apparently ineffective, 



the subliminal stimuli produce some latent effect, which 

 may be demonstrated by their additive action. The 



