HEARING. REACTION TIME 133 



soon as he feels the induction shock, closes the time-marker key. 

 The reaction time will be found to be greater than in the case of 

 hearing. 



DEMONSTRATIONS. 



1. Upper limit of range of hearing. 



2. Dissection of the semicircular canals in the skate. 



3. Model of human ear. 



4. Dissection of internal ear of mammal. 



CAMBRIDGE PRINTED BY J. B. PEACE. M.A.. AT THE UNIVERSITY PRESS 



