320 AYERS. 



propagated down the filaments to the sentient protoplasm of 

 the sensory cells, which are directly continuous with the nerve 

 fibres of the cochlear nerve. These are the only structures of 

 the cochlea directly concerned in the picking up and trans- 

 mitting auditory stimuli to the brain. Waves of the endolymph 

 are propagated continuously through the canal, and the auditory 

 hairs are consecutively affected thereby, as a result of which 

 the psychical phenomena of audition depend upon a series of 

 stimuli from the sensorium varying in intensity and frequency 

 and number with the sound waves which gain admittance to 

 the endolymphatic fluid. 



