28 TADACHIKA MINOURA 



8. Embryo no. 18-9 (fig. 32). Operated. November 23, 1917. 

 Piece of ovary from a young hen grafted on an embryo of eight 

 days. Opened December 4th. Age of embryo, 19 days; dura- 

 tion of graft, 11 days. 



Result: Gonads of the male type in general; left one larger 

 than the right; left gonad, 5 x 1.5 mm.; right gonad, 3.8 x 1 

 mm. Surface of the left gonad rough in texture, differing from 

 that of the normal testis. Wolffian ducts of the male type; 

 slight traces of the posterior portions of the miillerian ducts 

 present on both sides. 



9. Embryo no. 29-5 (fig. 35). Conditions of the experiment 

 same as for no. 29-7. Age of embryo, 19 days; duration of 

 graft, 8 days. 



Result: Gonads of the female type, but the right gonad much 

 elongated in form and larger than the normal right ovary; left 

 gonad, 4.2 x 1.6 mm.; right gonad, 3 x 0.4 mm. Wolffian 

 ducts more or less of the male type. Miillerian ducts developed 

 on both sides; the posterior part of the right duct more developed 

 than is the case in the normal female condition. 



10. Embryo no. 1-7. Operated June 14, 1917. Piece of 

 adult ovary grafted on an eight-day embryo. Opened June 

 24th. Age of embryo, 18 days; duration of graft, 10 days. 



Result: Gonads of the female type; left gonad shortened and 

 of irregular shape; right gonad elongated; left gonad 5; right 

 gonad 3 mm. in length. Wolffian ducts rather of the male type; 

 miillerian ducts developed to about the same degree on both 

 sides. 



11. Embryo no. 30-6 (figs. 33, 34). Operated June 5, 1918. 

 Piece of ovary about 2 mm. square from a week-old chick grafted 

 on a nine-day-old embryo. Opened June 14th. Age of embryo, 

 18 days; duration of graft, 9 days. 



Result: Gonads of the female type, the right gonad remark- 

 ably slender; left gonad, 4.5 mm.; right gonad, 4 mm. in length. 

 Wolffian and miillerian ducts of the female type. 



12. Embryo no. 17-4 (fig. 36). Operated November 19, 1917. 

 Whole ovary of a thirteen-day-old embryo grafted on a thirteen- 

 day-old embryo. Opened November 26th. Age of embryo, 

 20 days; duration of graft, 7 days. 



