COVER -- CONTENTS -- INTRODUCTION -- SEX AND PROCREATION -- REPRODUCTION -- VIRGINAL REPRODUCTION OR PARTHENOGENESIS -- INTERSEXES -- GAMETOGENESIS -- THE DISCHARGE OF SEX CELLS -- FERTILIZATION -- CLEAVAGE -- MORULA AND BLASTULA -- GASTRULATION -- DIFFERENTIATION -- METAMORPHOSIS -- THE HORMONAL CONTROL OF METAMORPHOSIS -- EMBRYONIC INDUCTION -- NUCLEO-CYTOPLASMIC INTERACTION -- REGENERATION -- FOETAL MEMBRANES -- PlACENTATION IN MAMMALS -- DEVELOPMENT OF BALANOGLOSSUS -- DEVELOPMENT OF HERDMANIA -- DEVELOPMENT OF COLONIAL ASCIDIANS -- DEVELOPMENT OF AMPHIOXUS -- DEVELOPMENT OF LAMPREY OR PETROMYZON -- EMBRYONIC DEVELOPMENT OF FISHES -- DEVELOPMENT OF FROG -- DEVELOPMENT OF CHICK -- EMBRYOLOGY OF THE MAMMALS -- PARENTAL CARE OF THE EMBRYO -- GLOSSARY OF EMBRYOLOGICAL TERMS -- INDEX.