THE AIM AND ACHIEVEMENTS OF SCIENTIFIC METHOD. 39 



filled me, and my interest in this paragraph all lie distinct 

 in my consciousness, but in no sense outside or alongside of 

 each other."* They enter into this special relation with one 

 another only when they come to be " discriminated as parts 

 from out . of a Ikrger enveloping space:"f ^ This discrimination 

 is rendere4 possible in many cases by a d^ference^ in the 

 " immanent sensibility " of the different parts of the sense 

 organs, so that each " carries its special sign/'f while it is 

 greatly aided by movements, either of the object or of the 

 sense-organ. Given that we have in this way analysed a 

 number of original vague vastnesses into a mass of correlated 

 spatial details, the problem now arises of summing these sense- 

 spaces into what we commonly think of as " real space." This 

 process occurs through the mediation of constant external 

 things, with which different sense-organs, or different parts of 

 the same sense-organ, come into relation from time to, time. { 

 Through the long-continued commerce of the sense-organs with 

 these constant external things we come either to regard different 

 spatial feelings as equal to one another, or to select certain 

 ones as feelings of the real size and shape of things, and to' 

 degrade others to the status of being merely signs of these. 

 When, as in the case of the mouth, we have what we may think; 

 of as an external thing with which a special set of sense- 

 organs those of the tongue has dealings, tiie thing in questioii 

 comes to form " almost a little world in itself,"|| whose spatial 

 values have never been reduced to agreement with those 

 yielded by the other sense-organs. This fact is readily 

 exemplified by the simple experiment of exploring the teeth 

 with the tip of the tongue, and then repeating the investigation 

 with a finger-tip. 



* P. 146. 

 t P. 147. 



I P. 167. 



P. 181 etseq. P. 269. 



II P. 181. 



