414 



JOHN LEWIS BREMER 



a 



r^ \\\\ 



8 



4 



J 



Figs. 7, 8 and 9 Models; human fetus of 9.1 cm., age given as three months. Tu- 

 bules from different parts of same testis; figs. 8 and 9 two views of same model. 

 The rete cords are slender with cut ends. The large cut ends represent anastomoses 

 with tubules not modeled. Loops formed by radial tubules and cross connec- 

 tions are seen, some including the peripheral set of cross connections, some the 

 second set; while shorter connections of the central set can be made out nearer 

 the mediastinum. In fig. 8, at «, a peripheral loop is just breaking apart; in fig. 7, 

 at X, another has just been severed. At h and c, in figs. 8 and 9, the tubules are very 

 small and will probably part in a short while. Tubule A is unconnected except 

 near the rete, and consists of a radial cord with the greater part of a peripheral 

 loop. Tubule B has a short anastomosing branch representing the inner set (at 

 e) and a looped end consisting of the outer two sets of connections and the part of 

 the radial tubule between them, the rest of which has been lost. Tubule C has all 

 three sets of connections represented. Ring formation can be seen at ?•. X 90 

 diam. 



Fig. 10 Model; human fetus of about 10.0 cm., age given as lOG days. Convolu- 

 tions have begun, chiefly in the cross connections ; the tubules have become of nearly 

 even diameter. The only blind ends are at x and ij. Tubule A is connected with 

 three rete tubules, and extends only to (he inner cross ooimection, which can be 

 traced through a few convolutions to another radial limb, also without branches 

 till near the rete, a separate short loop is thus made. C'ross connections belonging 

 to the other two sets are recognizable, and can be traced easily in the actual model. 

 X 90 diam. 



