ss 



Fig. 5 A, line drawing of the model of the auditor}' apparatus with accessories 

 as assembled for experiments; see reference letters on page 478 for names and 

 purposes of parts. B, line drawing of the type of brass organ reed used for pro- 

 ducing sound waves in most of the experiments. C, line drawing showing the 

 artificial tectorial membrane as attached to wooden spiral lamina which fitted as 

 a water tight partition dividing the trough of the model into scala vestibuli and 

 scala tynipani. 



AMERICAN JOURNAL OT ANATOMY, VOL. IS, NO. 3 



