CONSERVATION OF ENERGY 237 



relation which has not yet been made quite 

 clear. 



Before leaving the matter there are certain 

 points which must not be left out of considera- 

 tion. Let us commence by considering the ques- 

 tion of " direction," which we have already 

 raised. 



We recognise, of course, that there is a Directive 

 certain amount of energy displayed in all power 

 material activity. But this is not all. There 

 is also a directive power, and this power plays 

 the part of an orienter, so to speak, of the 

 energy, though it does not increase or diminish 

 its sum. We have, therefore, to recognise a 

 qualitative element in all such operations. In 

 fact, mechanism itself remains absolutely in- 

 explicable if we try to reduce everything to the 

 play of mechanical forces. 



Hence we are driven, at all costs, to recognise 

 i duality, the very duality so much objected 

 to by the monistic school. 



It is quite clear that an agent may modify the 

 direction of a force or a moving particle without 

 altering the quantity of its energy or adding 

 to the work done. That is to say, it is possible 

 o bring forward an example of a purely quali- 

 tative influence. 



For a power acting at right angles to the 

 motion of a body can alter the direction of that 



