THE TESTIS SPERMATIC FLUID. 



Fig. 165. 



553 



Human Testis, injected with mercury as completely as possible ; 1, 1, lobules formed of the seminiferous 

 tubes; 2, rete testis; 3, vasa efferentia; 4, flexures of the efferent vessels passing into the head. 5, 5, of the 

 epididymis; 6, body of the epididymis ; 7. appendix ; 8, cauda; 9, vas deferens. (After Lauth.) 



Fig. 166. 



Plan of the structure of the Testis and Epididymis ; a, a, seminiferous tubes ; a*, a*, their anastomoses 

 the other references as in the last figure. 



( 667, c) ; arising from their lower and inner sides, whilst the Kidneys spring from their 

 upper and outer parts. They make their first appearance in the Chick about the fourth 

 day, as delicate, striae on the Wolffian bodies ; and at this period no difference can be 

 detected between the Testes and the Ovaria, which originate in precisely the same manner. 

 Like the kidneys, the germ-preparing organs increase in proportion with the diminution 

 47 



