THE FOURTH DIMENSION AND THE POSSI- 

 BILITY OF A NEW SENSE AND NEW 

 SENSE-ORGAN 



HIS subject has now found its way not only into 

 semi-scientific works but into our general litera- 

 ture and magazines. Even our novel-writers 

 have used suggestions from this hypothesis as 

 part of the machinery of their plots so that it properly 

 finds a place amongst the subjects discussed in this 

 volume. 



Various attempts have been made to explain what is 

 meant by "the fourth dimension," but it would seem that 

 thus far the explanations which have been offered are, to 

 most minds, vague and incomprehensible, this latter condi- 

 tion arising from the fact that the ordinary mind is utterly 

 unable to conceive of any such thing as a dimension which 

 cannot be defined in terms of the three with which we are 

 already familiar. And I confess at the start that I labor 

 under the superlative difficulty of not being able to form 

 any conception of a fourth dimension, and for this incapac- 

 ity my only consolation is, that in this respect I am not alone. 

 I have conversed upon the subject with many able mathe- 

 maticians and physicists, and in every case I found that 

 they were in the same predicament as myself, and where I 

 have met men who professed to think it easy to form a 

 conception of a fourth dimension, I have found their ideas, 

 not only in regard to the new hypothesis, but to its corre- 



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