PHYSIOLOGICAL ACOUSTICS 299 



the head, in which case the original difference of phase would 

 produce a slight difference of intensity on the two sides owing 

 to interference between the direct and transmitted vibrations*. 

 It is impossible to suppose, however, that this difference could 

 be other than exceedingly minute. 



* Myers and Wilson, Proc. Roy. Soc. vol. LXXX. A, p. 260 (1908). This 

 hypothesis is discussed by Lord Kayleigh, Proc. Roy. Soc. vol. Lxxxm. A, p. 61 

 (1909). 



