PLATE 1 



Figs. 1 and 2. Genital region of rat D5, 11 months after substitution of the 

 testicular parenchyma by paraffin pellets. 



In 1: the intra-abdominal position of the "testicles" before treatment is marked 

 with ink. 



In 2: after 15 days' treatment with testosterone propionate; prominence of the 

 descended testicles is seen in the well-developed scrotal pouch. 



Fig. 3. Reproductive system of rat, 6 months after implantation of paraffin 

 pellets, well tolerated by the albuginea, which appears smooth and vascularized. 



Fig. 4. Rat 9, 70 days after extirpation of the scrotal pouch. Testicles fairly 

 descended, distending the extragenital skin. 



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