CONTENTS 



VI. THE DEVELOPMENT OF PATTERN 93 



How the organizer works — Particular 

 causes and the general pattern— Regenera- 

 tion 



VII. THE FINAL ADJUSTMENTS 102 



How embryos are fed— Growth— The in- 

 fluence of function— The nervous system 

 and development — Hormones — Sex — 

 The part played by the genes in develop- 

 ment 



SUMMING UP 126 



INDEX 128 



