Modification by Experience 269 



perience may suffice as well as a repeated experience to pro- 

 duce long retention. But the fact is that a single vivid ex- 

 perience amounts to a repeated experience, because it is 

 usually recalled so often in idea. If we could imagine a 

 person's having a very forcible impression, which he did not 

 once recall for a long period of years, it is doubtful whether 

 he could recall it at the end of that time with anything like 

 the success which attends his recollection of the familiar sur- 

 roundings of his childhood. 



