CLASSIFICATION OF KNOWLEDGE 15 



light itself, and fail also to discover a host of new 

 relations which are brought out successively as our 

 different coloured lights are employed one after 

 another. 



Now, all this is only an allegory. It is not meant 

 that there is any real connection between knowledge 

 and a triangle, or that physicists in reality see things 

 red and psychologists blue. Yet analogies have 

 their uses. They prove nothing ; but they may 

 give clarity of vision to a mind which, without them, 

 would be confused ; they may even serve to suggest 

 new relations which perhaps, when suggested, can 

 be demonstrated and confirmed by more logical and 

 rigorous methods. Let our allegory be recognised 

 as such, and, however little it may help, it can da 

 no harm. 



