TWO THEORIES OF KNOWLEDGE 63 



which is therefore for each of us the sure in- 

 dicator of the Real. In recognising this fact the 

 sensationalist is right in his turn. 



Not only does the dynamic conception of Nature 

 enable us to account for Sensation, but it lets us see 

 how the Sensible World becomes a constituent of 

 Experience. It is by and through its obstructions 

 and these only that we featurise or denote our Ex- 

 perience. It is by the breaks, the turnings in the 

 road that we cognise its course. It is by the line of 

 rocks and breakers that we define the shore. But we 

 must not mistake the turnings for the roadway 

 nor the shore for the ocean. 



It is in and by our activity that we discover this 

 World of sensible obstructions. The features of the 

 Sensible World correspond therefore to the laws of 

 our exertional activity, but the correspondence is 

 relational, not resemblant. Just so, it is by the 

 reflection of Light that we discover the forms of the 

 obstacle which solid bodies oppose to the radiant 

 undulation. The resultant colours correspond to 

 the form of these obstructions ; but the correspond- 

 ence is relational not resemblant. The same is true 

 of sounds, of tactual sensations, of every other 

 sensible obstacle to pure activity. 



By the clouds of smoke we follow or used to 



