PHYSIOLOGICAL PARADOXES. 



It is difficult to know which is the more 

 striking the remarkable harmony of struc- 

 ture displayed by all the vertebrate animals, 

 or the wonderful completeness of the varieties 

 and differences obtained by mere modification 

 of organs originally similar. 



PRINTED BY CASSEUL & COMPANY, LIMITED, LA BEI^E SAUYAGE, LONDON, E.G. 



