1903.] Observations on the Sex of Mice. 45 



23. Doe D 3 ' 3 (D 3 + a, born August 2, 1902). 



<?• ?. ?. <?. 



To i Oct. 28/02 2 2 2 ra. 11 m. 



2 2 



24. Doe O 2 - 1 (0 2 + a, born October 2, 1902). 



To a Dec. 22/02 2 3 2 m. At least 11 J m. 



2 3 



25. Doe C 1 ' 2 ' 2 (C l - 2 + a, born October 2, 1902). 



To a Dec. 27/02 2 5 2 m. At least 11J m. 



2 5 



26. Doe O 2 - 2 - 1 (O 1 - 2 - 2 ^^ born December 27, 1902.) 



To a May 13/03 2 6 4 m. At least 16 m. 



„ 7] June 24/03 3 4 5 „ „ 5 „ 



5 10 



27. Doe G (age and ancestry lost, but under 3 months). 



<?. ?. ?• (?• 



Tot May 22/03 1 2 About 3 m. m. 



„ ^ June 29/03 5 2 „ 4 „ At least 5 m. 



6 4 



28. Doe H (age and ancestry lost, but under 3 months). 



$. ?. ?. <J. 

 To 77 July 17/03 6 2 About 3 m. At least 6 m. 



6 2 



