HAEMONY m MUSIC. 



87 



and more gently descending crests, but so related that, by re- 

 versing the figure, the elevations would exactly fit into the 

 depressions. But in D we have pointed crests and flattened 

 hollows, which are, however, symmetrical with respect to right 

 and left. 



Other forms are shown in Fig. 10, which are also compounded 

 of two simple waves, A and B, of which B makes three times as 

 many vibrations in a second as A, and consequently is the 



FiQ. 10. 



twelfth higher in pitch. The dotted curves in C and D are, as 

 before, repetitions of A. C has flat crests and flat hollows, D 

 has pointed crests and pointed hollows. 



These extremely simple examples will suflice to give a con- 

 ception of the great multiplicity of forms resulting from this 

 method of composition. Supposing that instead of two, several 

 simple waves were selected, with heights and initial points 

 arbitrarily chosen, an endless variety of changes could be 



