84 



EXPERIMENTAL PHYSIOLOGY. 



FIG. 52. Musical sound waves. Nos. 1 and 2 are simple harmonic curves; Nos. 

 3 and 4 are composed of a fundamental of the period of No. 1 with an overtone of 

 the period of No. 2 super-imposed on it in different phases. 



FIG. 53. Diagram of a vibrating violin-string to show how the various overtones arise. 



