CONFORMITY WITH PLAN 301 



In order to express in the familiar formulse also the 

 impulse-systems active in time, we have only to replace the 

 I by a series iii, and to write these one below the other. Let 



the instinct formula serve as an example. It must be written 



1 



,, R MO AOi E T-, , , , ,.„ 



thus : — T ~ T ~ i "" T • would be still more expressive, 



if we introduced the iii as musical notation. 



A formula of this kind would take account of the fact, 

 that, for instance, the funnel-roller beetle performs its action 

 in melodic sequence, although the birch-leaf on which it 

 does its work does not furnish it with any standard for the 

 action-melody. 



We shall do justice to the unified action-sequences of 

 instinctive animals, and to the plastic actions of animals 

 that learn by experience, only when we recognise an impulse- 

 melody that determines the action-sequence. The indications 

 of the surrounding-world serve, it is true, to release these, and 

 at times to retard or to quicken their course. But they have 

 no influence whatsoever on the melody of the action. As if 

 on its own hinges, the melody hangs fixed and infallible, within 

 the rhythm determining its internal equilibrium. 



RHYTHM 



In a melody we distinguish three things — the notes, the 

 sound-sequence, and the beat-sequence. In melody only the 

 last of these is described as rhythm. But it is different as 

 soon as we transfer the word melody into other associations. 

 If we compare some living process with a melody, the beat — 

 the rate at which the process takes place — interests us quite 

 secondarily ; on the other hand, the regular alternation in 

 which the part-processes release one another, comes into 

 prominence, and is then described as rhythm, although it really 

 corresponds to what we describe as sound-sequence in the 

 melody. 



