EFFECTS OF GONAD GRAFTS IN CHICKS 25 



11. Embryo no. 45-23. Conditions of the experiment the 

 same as in nos. 45-18 and 45-6. The graft exhibited marked 

 growth and possessed well-estabhshed vascular connections. 



Result: Gonads of the male type; left gonad, 3.3 x 0.8 mm.; 

 right gonad, 2.8 x 0.7 mm. The left is longer and the texture 

 of its surface different from that of the right. Wolffian ducts 

 rather of the male type; no trace of the mtillerian ducts. 



12. Embryo no. 8-5. Operated August 29, 1917. Adult 

 testis grafted on an embryo of five days. Opened September 

 11th. Age of embryo, 18 days; duration of the graft, 13 days. 



Result: Gonads of the male type; left gonad, 3.5 mm., right 

 gonad 2.5 mm. in length. Wolffian ducts of the male type. 

 Anterior portion of the right mtillerian duct and posterior portion 

 of the left one present. 



13. Embryo no. 22-13 (fig. 22). Operated December 19, 

 1917. Piece of adult testis grafted on an embryo of eleven 

 days. Opened December 26th. Graft showed good growth, 

 7x8 mm. in dimensions. Age of embryo, 18 days; duration of 

 graft, 7 days. 



Result: Gonads of the female type in general; left gonad, 4.5 

 X 1.5 mm.; right gonad, 3x1 mm. The right gonad is mark- 

 edly larger than is the case in the normal female of this age. 

 Wolffian ducts of the male type; mtillerian ducts of the female 

 type. 



14. Embryo no. 17-7 (figs. 23, 24). Operated November 19, 

 1917. Two pieces of testis from a week-old chick were implanted 

 on a thirteen-day-old embryo. Examined November 26th. Age 

 of embryo, 19 days; duration of graft, 6 days. 



Result: Gonads of the female type; left gonad, 4.5 x 1.7 

 mm.; right gonad, 3.3 x 0.5 mm. Right gonad larger and more 

 distinctly outlined than in normal females of the same age. 

 Wolffian ducts more or less of the female type; mtiUerian ducts 

 of the female type, but their posterior ends not differentiated to 

 the normal degree. 



15. Embryo no. 45-15. Conditions of the experiment the 

 same as in nos. 45-18 and 45-6. 



