III THE CORPUS LUTEUM AND OTHER 

 FOLLICULAR DERIVATIVES IN VERTE- 

 BRATES 77 



1 THE STRUCTURE OF THE OVARY 77 



2 HISTOGENESIS OF THE CORPORA LUTEA ... 81 



3 THE OVO-FOLLICULAR SYSTEM 93 



4 THE POTENTIALITIES OF THE FOLLICLE ... 96 



5 SERIAL REPETITION OF THE POSSIBLE MODIF- 

 ICATIONS IN THE FOLLICLE 101 



6 THE DERIVATIVES OF FOLLICULAR INVOLUTION 

 AND THE INTERSTITIUM 108 



7 THE SIGNIFICANCE OF THE CORPORA LUTEA 

 AND OTHER FOLLICULAR DERIVATIVES IN THE 

 SEXUAL-ENDOCRINE ORGANIZATION OF VERTE- 

 BRATES 110 



8 THE FREQUENCY OF THE FOLLICULAR DERIVAT- 

 IVES IN THE DIFFERENT GROUPS OF VERTE- 

 BRATES 113 



9 SUMMARY 116 



IV THE CYCLIC CHANGES IN THE SEXUAL- 

 ENDOCRINE ORGANIZATION OF NON- 

 MAMMALIAN VERTEBRATES 117 



1 THE SEXUAL CYCLE OF Rhodeus amavus ? . . 117 



2 THE SEXUAL CYCLE OF Zoarces Viviparus 9 . 126 



3 THE SEXUAL CYCLE OF Le6/sfes rer/ca/afas ? . 129 



4 THE SEXUAL CYCLE OF Bufo bufo $ AND ? . 134 



5 SUMMARY 140 



BIBLIOGRAPHY . 143 



INDEX 145 



