THE TESTICLE AND THE OVARY 345 





FIG. 87. Normal Rouen duck. (From Goodale.) (Cf. Figs. 86, 88, and 89.) 



FIG. 88. Ovariotomised Rouen duck Type I. 

 (From Goodale.) 



(Cf. Figs. 86, 87, and 89.) The bird was operated 

 upon when six \vri-ks old. 



