306 ON SENSATION AND THE UNITY C j 1 



It will be observed that the sensiierous wall 

 and the external world are of the same nature; 

 whatever it is that constitutes them both is ex- 

 pressible in terms of matter and motion. Whatever 

 changes take place in the sensiferous apparatus are 

 continuous with, and similar to, those which take 

 place in the external world.* But, with the sen- 

 sorium, matter and motion come to an end; while 

 phenomena of another order, or immaterial states 

 of consciousness, make their appearance* How is 

 the relation between the material and the im- 

 material phenomena to be conceived? This is 



* The following diagrammatic scheme may help to eluci- 

 date the theory of sensation : 



Mediate Knowledge 



/ A -N Immediate 



Sensiferous Apparatus Knowledge 



Objects of Ser.se 



Receptive, Transmissive, Sensiflcatory 

 (Sense Organ) (Nerve) (Sensorium) 



Hypothetical Substance of Matter 



Sensationsand 

 other States of 

 Consciousness 



Hypothetical 

 Substance of 

 Mind 



Physical World Mental World 



Not Self Self 



Non-Ego or Object Ego or Subject 



Immediate knowledge is confined to states of consciousness, 

 or, in other words, to the phenomena of mind. Knowledge 

 of the physical world, or of one's own body and of objects 

 external to it, is a system of beliefs or judgments based on 

 the sensations. The term " self " is applied not only to the 

 series of mental phenomena which constitute the ego, but to 

 the fragment of the physical world which is their constant 

 concomitant. The corporeal self, therefore, is part of the 

 non-ego ; and is objective in relation to the ego as subject. 



