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 weeks old. 



