1024 JUDGING DIRECTION OF SOUNDS. [BOOK m. 



of intensity produced on the one hand by a tuning-fork being 

 held before him, first with the broad edge of the fork toward 

 him and then with the narrow edge, and the difference on the 

 other hand caused by the removal of the tuning-fork to a distance. 

 And our judgments in this respect may be false, as is seen in the 

 effects produced by the ventriloquist. We can on the whole 

 better appreciate the distance of noises than of musical sounds, 

 differences of quality as well as of intensity playing the same 

 part in the judgment of distance as of direction ; when a sound 

 becomes distant the intensity of the fundamental tone dimin- 

 ishes more rapidly than do those of the higher partial tones, 

 and hence the quality of the sound is 



