350 Mr. H. E. Roaf on the Analysis of 



deformed by less force, and at the same time there is a larger 

 area for any pressure to act upon it. Thus the distal end 

 of the cochlea will be moved by a lower pressure than will 

 affect the proximal end. 



Fig. 1. 



e'. 



J 



Diagram to show variations in area of the cochlear tubes and basilar 

 membrane. The cochlea is represented as uncoiled. From Sir 

 Arthur Keith, appendix to ' The Analytical Mechanism of the 

 Internal Ear.' 



Fig. 2. 



Diagram to show cross section of cochlear tube, the connexion of the 

 scala vestibuli and scala tympani with the stapes and fenestra rotunda 

 respectively are indicated by a break in the wail closed by a dotted 

 line. From Sir Arthur Keith, appendix to ' The Analytical 

 Mechanism of the Internal Ear.' 



S.Y.=scala vestibuli; S.T. =scala tympani; S. = stapes; R. = fenestra 

 rotunda; H. = heIicotrema ; B. =basilar membrane. B'. = surface 

 view of basilar membrane. 



The mechanical conditions on which movement - 

 organ of Corti depend are practically unknown. 



or the 

 If the 

 basilar membrane consists merely of stretched strings and 

 the rods of Corti behave as hinged structures, the force. 



