HEARING AND CEREBELLAR FUNCTIONS 



135 



associated with the organs of the hiteral Hue which as Dr. Sands 

 has shown are the organs for the reception of waves of low 

 frequency. 



Accortling to Sand, Hoagland was the first to discover the spon- 

 taneous activity of the lateral -line receptors and the former has 



PLATE 26. 



A transverse section a little anterior to that shown in the previous Plate. The cere- 

 bellum is larger. The acoustic tubercles are very prominent and have a tri- 

 angular shape in section with a curved base. Where the apices approach each 

 other the round celled tissue is replaced by scattered large cells. A small 

 area of central acoustic tissue is still seen. S.P. — Cells of Purkinje. S.S.L. — 

 Somatic-sensory lobes. 



shown that the lateral-line system is exceedingly sensitive to low- 

 frequency \dbrations. " Direct mechanical stimulation of the lateral 

 line, as well as vibrations propagated from a distance, are effective 

 in exciting the reception, on account of the movements they cause 

 to occur in the endolymph of the canals." Let us consider what 

 theoretical advantage to a deep-sea fish there would be in the in- 

 creased development of the acoustic tubercles. 



