THE DOCTRINE OP ENERGY 119 



apparent apriority and necessity of the qualities of 

 Space, and at the same time for their evident uni- 

 versality and objectivity. 



In a word, it would rather seem as if Science, 

 unconscious of its pregnant possibilities, has not only 

 formulated a theory which co-ordinates and unifies 

 the entire fabric of physical knowledge, but has also 

 at length furnished Philosophy with the key to that 

 problem the solution of which has, in the words of 

 Schopenhauer, been the main endeavour of philo- 

 sophers for more than two centuries, namely, to 

 separate by a correctly drawn line of cleavage the 

 Ideal that which belongs to our knowledge as such 

 from the Real, that which exists independently 

 of us ; and thus to determine the relation of each to 

 the other. 



To us it seems not strange that Philosophy should 

 in the end be indebted to Science for this solution 

 nor should Science, in the hour of her greatest 

 speculative victory, object too hastily to the assist- 

 ance which the thinker, trained to the study of the 

 process of thought, can render in clarifying and re- 

 stating in its metaphysical aspects a theory which, 

 if profoundly conceived, and formulated by men of 

 science from Rumford and Davy to Stewart, Tait, 

 and Kelvin, was partially anticipated by the meta- 

 physician who conceived the world as will and idea. 



