150 MYSTICISM AND LOGIC 



this statement &quot; matter,&quot; &quot; view from a given place,&quot; 

 &quot; appearance/ &quot; intervening medium &quot; will all be de 

 nned in the course of the present paper.) We have not 

 the means of ascertaining how things appear from places 

 not surrounded by brain and nerves and sense-organs, 

 br cause we cannot leave the body ; but continuity 

 makes it not unreasonable to suppose that they present 

 some appearance at such places. Any such appearance 

 would be included among sensibilia. If $er impossibile 

 there were a complete human body with no mind in 

 side it, all those sensibilia would exist, in relation to that 

 body, which would be sense-data if there were a mind in 

 the body. What the mind adds to sensibilia, in fact, is 

 merely awareness : everything else is physical or physio 

 logical. 



IV. SENSE-DATA ARE PHYSICAL 



Before discussing this question it will be well to define 

 the sense in which the terms &quot; mental &quot; and &quot; physical &quot; 

 are to be used. The word &quot; physical,&quot; in all preliminary 

 discussions, is to be understood as meaning &quot; what is 

 dealt with by physics.&quot; Physics, it is plain, tells us some 

 thing about some of the constituents of the actual world ; 

 what these constituents are may be doubtful, but it is 

 they that are to be called physical, whatever their nature 

 may prove to be. 



The definition of the term &quot; mental &quot; is more difficult, 

 and can only be satisfactorily given after many difficult 

 controversies have been discussed and decided. For 

 present purposes therefore I must content myself with 

 assuming a dogmatic answer to these controversies. 1 

 shall call a particular &quot; mental &quot; when it is aware of 

 something, and I shall call a fact &quot; mental &quot; when it 

 contains a mental particular as a constituent. 



