52 iOKMG IN THE WHITE RAT 



to be the better. In the experiments of Wohlgemuth (one ex- 

 periment), Froeberg, and Freeman the exposure time per term 

 was equal, and, except for Froeberg's work with nonsense syl- 

 lables, all results favor succession as the better mode. Froeberg 

 thinks his exception is not a proof of the superiority of the simul- 

 taneous mode, but is rather to be accounted for by the sense 

 material used. Although our results indicate a slight superiority 

 of the simultaneous mode, this is not sufficient to be of great 

 significance. These data seem to warrant the conclusion that 

 when the exposure time per term is unequal the simultaneous 

 mode is the better ; when it is equal the better mode of presenta- 

 tion depends upon the materials used. 



