294 ELEMENTAKY PHYSIOLOGY. [XXVIII. 



d. Two or more layers of cells with large 

 nuclei; long processes may be seen to 

 proceed upwards from some of these. 



e. Superficial columnar cells. 



/. Fine fibres projecting beyond the columnar 

 cells ; if care has not been taken these will 

 have been broken off ; in any case it will be 

 difficult to make out whether the processes 

 run between the cells or from their extremities. 

 In sections through any other part of the 

 ampulla observe, 



g. The thinner connective tissue wall, 



h. The single layer of short columnar or even 

 flattened cells. 



7. Place another ampulla in osmic acid 1 p.c. for 

 half-an-hour or longer ; tease out a piece of the 

 crista acustica in water or in dilute glycerine and 

 observe the nerve fibres with blackened medulla 

 in the wall of the tube, and the isolated cells 



8. Scrape off a little of the epithelium from the 

 crista acustica of a fresh ampulla and tease out 

 in a drop of endolymph to observe the characters 

 of the fresh cells. 



