LIST OF ILLUSTRATIONS 



xvu 



Fig. 



80. a similar section ........ 



81. Interstitial cells of a normal adult guinea pig , 



82. Section through upper testicular fragment of guinea pig 



subjected to "complex" testicular section 



83. Section through testicle of guinea pig subjected to 



OPERATION V. OF FiG. 64 . . . . , . 



84. Section through upper testicular fragment (guinea pig) 



85. Diagram to illustrate the hypothesis that the so-called 



compensatory hypertrophy of the remaining testicle 

 is only an accelerated growth 



86. Section through testicle of rabbit 14 months old, uni 



laterally castrated when i^ months old 



87. Section through testicle of rabbit, 8 months old, with 



eunuchoid penis ...... 



88. Section through upper testicular fragment (guinea pig) 



89. Diagram: Dependence of hormonic effect upon the 



quantity of testicular hormones 



90. Diagram to illustrate the law of "All or Nothing" 



91. Cyclic development of generative and interstitial tissue 



OF THE testicle OF HIBERNATING MAMMALS . 



92. Section through testicle cut horizontally . 



93. Diagram: Cyclic development of generative and inter 



STITIAL TISSUE OF THE TESTICLE OF AMPHIBIANS . 



94. Ovary of rabbit 18 months old . . . 



95. Section through ovary of rabbit .... 



96. Interstitial tissue in the ovary of Phascolomys 



97. Lutear and interstitial cells .... 



98. Section through ovary of pregnant rabbit 

 99A. Development of interstitial tissue of the ovary in rabbit 

 99B. Another section ....... 



99c. Another section . . . . . 



100. Section through ovary of rabbit 2J weeks old 



loi. Section through ovary of adult cat 



102. Growing primary follicle in rabbit 7 months old 



103. Young Graafian follicle in rabbit ii^ months old . 



104. Section through ovary of white rat, 62 days old 



105. Influence of X-rays on sex characters in virginal female 



guinea pig ........ 



106. Other sections ........ 



107. Section through ovary engrafted six months previously 



into a castrated male ..... 



108. Section through ovary engrafted a year previously on 



a castrated male ...... 



109A. Disappearance of primary ova in highly hypertrophied 



MINUTE ovarian FRAGMENTS .... 



109B, Another section, after treatment .... 

 II OA. Decrease of number of oocytes in ovarian fragment 

 HOB. Another section ....... 



111. Section through ovary of pregnant cat 



112. Section through fresh corpus luteum of rabbit 



113. Influence of the corpus luteum on the mammary gland 



of the rabbit ...... 



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