52 HARRY H. WYLIE 



they do not maintain it with any high degree of regularity 

 at all. Because no promise of further results was evident 

 and because of the negative results in learning sound with 

 groups already reported the work with these animals was 

 discontinued. 



(2) Sound to Light, — Since no animals learned the posi- 

 tive response to the sound we had none to transfer from 

 sound to light. This part of our program had to be aban- 

 doned. 



B. Negative 



(1) Light to Sound, — -Three groups of animals were first 

 taught the negative response to the light and then were 

 transferred to the sound. Group VIII was transferred 

 directly from light to sound. Group IX was given two 

 series of simultaneous light and sound stimuli after having 

 learned the response to the light and then were transferred 

 to the sound. Group X was given four series of simul- 

 taneous light and sound stimuli after having learned the 

 light and then were transferred to the sound. The results 

 are gathered together in the following tables. These tables 

 indicate the number of series and trials necessary for learn- 

 ing the response to the sound after having learned the 

 response to the light, and after having been trained with, 

 the simultaneous light and sound wherever such training 

 was given. Illustrative curves showing the complete 

 records of certain individuals may be seen on pages 33-35. 



To understand these tables one must keep in mind that 

 only fifteen chances to respond to the stimulus were given 

 in each series of twenty trials. 



Group VIII Group IX 



This group was transferred directly from This group was given two series of 



light to sound simultaneous light and sound 



Animal Trials Series Animal Trials Series 



No. 53 150 10 No. 77 165 11 



No. 54 150 10 No. 78 150 10 



No. 55 150 10 No. 79 165 11 



No. 56 165 11 No. 80 120 8 



No. 57 150 10 ■ 



No. 58 150 10 Average 150 10 



Average 152.5 10.16 



