CONTENTS 



PAGE 



PUBLICATIONS BY THE SAME AUTHOR .... viii 

 THE GROWTH IN LENGTH OF THE VERTEBRATE EMBRYO 



LECTURE I 1 



LECTURE II 24 



LECTURE III 47 



THE GEOMETRICAL RELATION OF 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 



