CONTENTS 



PAGE 



PUBLICATIONS BY THE SAME AUTHOR .... viii 

 THE GROWTH IN LENGTH or THE VERTEBRATE EMBRYO 



LECTURE I 1 



LECTURE II 24 



LECTURE III 47 



THE GEOMETRICAL RELATION or THE NUCLEI IN AN IN- 

 VAGINATING GASTRULA (e.g. AMPHIOXUS) CONSIDERED 

 IN CONNECTION WITH CELL RHYTHM, AND DRIESCH's 

 CONCEPTION OF ENTELECHY 65 



LITERATURE REFERRED TO . 99 



