284 BRAINS OF RATS AND MEN 



conditions as to result in complete dissociation of cer- 

 tain components or complexes of experience which 

 among themselves form perfectly coherent unities 

 that remain quite outside the knowledge of the nor- 

 mal personal consciousness. When this is carried to 

 the extreme we have the remarkable cases of dual per- 

 sonalities or co-consciousness which have been de- 

 scribed by Morton Prince (1914) and many others. 



