30 On Radiant Matter. 



the little indivisible particles which with good warrant are 

 supposed to constitute the physical basis of the universe. 

 We have seen that in some of its properties Radiant Matter 

 is as material as this table, whilst in other properties it 

 almost assumes the character of Radiant Energy. We 

 have actually touched the border land where Matter and 

 Force seem to merge into one another, the shadowy realm 

 between Known and Unknown which for me has always had 

 peculiar temptations. I venture to think that the greatest 

 scientific problems of the future will find their solution in 

 this Border Land, and even beyond ; here, it seems to me, 

 lie Ultimate Realities, subtle, far-reaching, wonderful. 



" Yet all these were, when no Man did them know, 



Yet have from wisest Ages hidden beene ; 

 And later Times thinges more unknowne shall show. 

 Why then should witlesse Man so much misweene, 

 That nothing is, but that which he hath seene ?" 



London: Printed by H. J. DAVty.Boy Court, Ludgat: Hill, E.G. 



