PLATE 3 



EXPLANATION OF FIGURES 



13'"^ Sections tangential to the surface of the organ of Corti through the 

 third turn of the cochlea. Adult bat (Vespertilio fuscus). Zenker's fluid. Iron 

 hematoxylin, Congo red. The figures illustrate structures at five successive 

 levels of the organ of Corti. 



14 and 15 Vertical spiral sections of the organ of Corti, through the second 

 turn of the cochlea. Adult bat (Pipistrellus subflavus). Bouin's fluid. Iron 

 hematoxylin, Congo red, light green. 



16 Vertical spiral section of the organ of Corti through the second turn of 

 the cochlea. Adult bat (Pipistrellus 'subflavus). Trichloracetic acid. Iron 

 hematoxylin, Congo red, light green. 



17 Section tangential to the surface of the organ of Corti. through the 

 second turn of the cochlea. Adult white rat. Trichloracetic acid. Iron hema- 

 toxylin, Congo red, light green. 



18 Section tangential to the surface of the organ of Corti, through the third 

 turn of the cochlea. Adult rat (Mus decumanus). Bouin's fluid. Iron hema- 

 toxylin, Congo red, light green. 



320 



