174 SPACE, TIME, MATTER, MOTION, AND FORCE. 



garded only as a certain conditioned effect of the Uncondi- 

 tioned Cause as the relative reality indicating to us an 

 Absolute Reality by which it is immediately produced. 

 And here, indeed, we see even more clearly than before, 

 how inevitable is that transfigured realism to which sceptical 

 criticism finally brings us round. Getting rid of all compli- 

 cations, and contemplating pure Force, we are irresistibly 

 compelled by the relativity of our thought, to vaguely con- 

 ceive some unknown force as the correlative of the known 

 force. Noumenon and phenomenon are here presented in 

 their primordial relation as two sides of the same change, 

 of which we are obliged to regard the last as no less real 

 than the first. 



51. In closing this exposition of the derivative data 

 needed by Philosophy as the unifier of Science, we may 

 properly glance at their relations to the primordial data, set 

 forth in the last chapter. 



An Unknown Cause of the known effects which we call 

 phenomena, likenesses and differences among these known 

 effects, and a segregation of the effects into subject and 

 object these are the postulates without which we cannot 

 think. Within each of the segregated masses of manifesta- 

 tions, there are likenesses and differences involving sec- 

 ondary segregations, which have also become indispensable 

 postulates. The vivid manifestations constituting the non- 

 ego do not simply cohere, but their cohesions have certain 

 invariable modes; and among the faint manifestations con- 

 stituting the ego, which are products of the vivid, there 

 exist corresponding modes of cohesion. These modes of co- 

 hesion under which manifestations are invariably presented, 

 and therefore invariably represented, we call, when contem- 

 plated apart, Space and Time, and when contemplated along 

 with the manifestations themselves, Matter and Motion. 

 The ultimate natures of these modes are as unknown as is 

 the ultimate nature of that which is manifested. But just 



