xvi LIST OF ILLUSTRATIONS 



Fig. Page 



47. Section through uterus of a normal rat ... 89 



48. Section through the uterus of a castrated rat . . 90 



49. Section through the uterus of a rat with ovarian auto- 



transplantation . . . . . . .91 



50. Brain of frog ........ 99 



5 1 A. Section through testicle of normal guinea pig, aged about 



4^ MONTHS . . . . . . . . .110 



5 IB. Section through testicle of normal guinea pig, aged about 



41^ MONTHS . . . . . . . . .Ill 



52. Section through testicle of normal rabbit, 14 months old 112 



53. Group of interstitial cells in testicle of adult cat . 113 



54. Section through testicle of man 26 years old . . 114 

 54A. Section through testicle of human embryo of fifth month 115 



55. Section through testicle of ADULT CAT, STAINED WITH Sudan 116 



56. Interstitial cells of different animals . . . .117 

 57A. Development of interstitial tissue in guinea pig . , 118 

 57B. Development of interstitial tissue in guinea pig . . 119 

 57c. Development of interstitial tissue in guinea pig . . 120 

 57D. Development of interstitial tissue in guinea pig . . 121 



58. Section through testicle of guinea pig, 2 to 3 weeks old 123 



59. Section through testicle of rabbit, 2 months old . . 124 



60. Section through testicle of adult guinea pig . . 127 



61. Section through testicle of guinea pig 78 days after 



ligature of vas deferens . . . . . .128 



62. Testicle of adult guinea pig . . . . .131 



63. Testicle of adult guinea pig, about 18 months old , 132 



64. Diagram of different operations performed on the testicle 



OF mammal ......... 132 



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



eunuchoid penis . . . . . . .134 



66. Section through testicle of rabbit about 8 months old, 



with normal sex characters . . . . -135 



67. Section through testicle of rabbit 6J months old, with 



eunuchoid penis . . . . . . . i36 



68. Section through testicle of rabbit 6^ months old, with 



normal sex characters . . . . . .137 



69. Interstitial cells of rabbits with normal and eunuchoid 



penis . . . . . . . . . .138 



70. Section through testicle of rabbit 6 months old, with 



normal penis . . . . . . . .139 



71. Section through testicle of rabbit 6 months old with 



eunuchoid penis ....... 140 



72. Another section ........ 141 



73. Seminal VESICLES OF GUINEA PIG (4 states) .... 144 



74. Retained testicle of pig (bilateral cryptorchism) . . 146 



75. Retained testicle of pig (unilateral cryptorchism) . 147 



76. Section through testicle which 8 months previously had 



BEEN subjected TO AUTOTRANSPLANTATION (RAT) . 1 49 



77. Section through normal testicle of a rat about 9 months 



OLD . . . . . . . . . . 149 



78. Section through testicle of normal adult guinea pig . 151 



79. Upper testicular fragment of a partial " castrate " 



(guinea pig) ........ 151 



