1903.] 



Observations on the Sex of Mice. 



43 



11. Doe C 2 (C + a, born May 17, 1902). 









<?. 



? • 



?. 





lo 



a ... 



A 1 /AO 



... Aug. 1/02 



1 



1 



2 m. 



At least o^«m. 



33 





Alio- 22/02 



5 



1 





7 ' 



33 1 33 



33 





Sent. 22/02 



2 



4 



°2 " 



4 •"" 



33 * 33 



5) 



i 



Dec. 20/02 



3 



i> 



61 m. 



31 m. 



3) 





Feb. 4/03 



3 



3 



8 „ 



5 „ 



33 





May 20/03 





3 



12 „ 



2 „ 









14 



15 







12. Doe D 1 (D + a, born May 22, 1902). 



To 





July 31/02 



2 



5 





At least 6J m. 



33 



e 



Oct. 5/02 



3 



4 



3^ 3) 



4 



33 ^ 33 



33 



61 



Nov. 18/02 



5 



3 



5 m. 



21m. 



33 



8 



Jan. 13/02 



5 



2 



7 „ 



51 



J 2 " 



33 



8 



Feb. 24/03 



4 



4 



8* „ 



7 „ 



19 18 



13. Doe D 2 (D + a, born May 22, 1902). 



To a Aug. 7/02 1 4 2 m. At least 7 m. 



„ e Sept. 30/02 4 4 31 „ „ 4 „ 



„ e Oct. 23/02 4 3 41 „ 5 „ 



„ 1 Dec. 21/02 3 3 61 „ 3J m. 



12 14 



14. Doe D 3 (B + a, born May 22, 1902). 



<?. ?• 9- (J. 



To cc Aug. 2/02 3 3 2 m. At least 7 m. 



„ e Sept. 29/02 1 4 3,, 4 



„ 7 Dec. 12/02 3 5 51 „ 6 m. 



7 12 



15. Doe B 2 * 1 (B 2 + a, born July 12, 1902). 









s. 



?- 



?. <?. 



To 



a ... 



Sept. 11/02 



2 



3 



2 m. At least 8 m. 



33 





, Nov. 17/02 



1 



2 



4 „ „ 10 „ 



33 



S 



,, Jan. 15/03 



6 



3 



6 „ 51 m. 



33 





May 21/03 



3 



2 



10 „ At least 16 m 



33 



7) ... 



... July 8/03 



4 



2 



12 ,, ,, 5 ,, 









16 



12 





