162 RESPONSE IN THE LIVING AND NON-LIVING 



course of the experiment, the deflection in each curve 

 was measured from a line joining the beginning of the 

 response to the end of its recovery. A mean deflection, 

 corresponding to each intensity, was obtained by taking 

 the average of the descending and ascending readings. 

 The two sets of readings did not, however, vary to any 

 marked extent. 



The deflections corresponding to the intensities 1, 

 3, 5, 7, are, then, as 9'5 to 18, to 30, to 41. If the 

 deflections had been strictly proportionate to the inten- 



I O units. 



5 IOW7U.CS. O S 



Stimulus 

 FlG. 104. CUBVES GIVING THE KELATION BETWEEN INTENSITY OF LlGHT AND 



MAGNITUDE OF EESPONSE 

 In (a) sensitive cell, (b) in frog's retina. 



sities of light stimulus they would have been as 9*5 to 

 28-5, to 47-5, to 66-5. 



In another set of records, with a different cell, 

 I obtained the deflections of 6, 10, 13, 15, corresponding 

 to light intensities of 3, 5, 7, and 9. 



The two curves in fig. 104, giving the relation 

 between response and stimulus, show that in the case of 

 inorganic substances, as in the retina (Waller), magnitude 

 of response does not increase so rapidly as stimulus. 



After-oscillation. -When the sensitive surface is 

 subjected to the continued action of light, the E.M. 



