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. Fig.s. 86, 87, and 89.) The bird was operated 

 upon when six weeks old. 



