^-^: 



COMPARATIVE 

 PHYSIOLOGY 



31 



mi 



BY 



LANCELOT T. HOGBEN 



M.A.(Cantab.), D.Sc.(Lond.) 

 Assistant Professor in Zoology, McGili» UNiVERiiTY 



LONDON 



SIDGWICK & JACKSON, LTD. 

 1926 



