PLATE 1 



EX,PLANATION OF FIGURES 



Figures 1 to 9 are reproduced to scale 



1 Section across the 1st half turn of the spiral organ and its tectorial mem- 

 brane, cochlea of adult hog. 



2 Section across 3rd half turn of spiral organ of adult hog; same cochlea as 

 figure 1. 



64 



