2 THEORETICAL BIOLOGY 



we are dealing with quite another kind of space from that of 

 which we usually speak. 



Moreover, we must bear in mind that the sense-qualities, 

 and especially that of hearing, are not destitute of arrange- 

 ment, although they be cut off from space. The whole 

 musical scale is an example of systematic arrangement, 

 although there is no preconceived image of it among the 

 objects of experience. The order of the sounds is determined 

 a priori as the expression of our subjective organisation, which 

 precedes all experience. 



The order in which we receive at once each note as it 

 sounds, an order that determines with certainty its relation- 

 ship to all other musical sounds, is an " intensive methodical- 

 ness " peculiar to our mind. It is, to use Kant's words, a 

 ** transcendental form " of our intellect, vis-a-vis of which 

 the individual sounds constitute the " material " of knowledge. 



A very momentous question now faces us, — " How can 

 the intensive design of the psyche and the extensive design 

 of the brain be combined as concepts ? " We shall often 

 meet this question again. 



Turning again to space, we perceive that the two spatial 

 senses par excellence are sight and touch. And yet it is not 

 in virtue of their specific qualities that they are space-forming. 

 Colours, for instance, have a very remarkable relationship- 

 arrangement one with the other, as we know from the com- 

 plementary colours ; but this has nothing to do with spatial 

 relations. There must be other qualities in addition which 

 are space-forming. 



Local signs. The existence of specific spatial qualities 

 was deduced by Lotze and demonstrated experimentally 

 by Weber. 



If the two points of a pair of compasses are set one centi- 

 metre apart and are then drawn down the back, beginning 

 at the neck, the person experimented on at first feels the two 



