1903.] Observations on the Sex of Mice. 41 



Part II. — Records. 

 A. Does' Records. 



1. Doe A (bought on April 18, 1902, under breeding age). 



<?. ?• ?. <?• 



To a May 9/02 4 About 2 m. At least 4 m. 



„ p June 22/02 4 3 „ 3 „ „ 5 „ 



„ y Oct. 2/02 4 „ 7 „ „ 4 „ 



12 3 



2. Doe B (bought April 18, 1902, under breeding age). 

 To a May 11/02 4 3 About 2 m. At least 1 m. 



, p ... 



July 16/02 



4 



1 



35 °2 " 



41 



55 *2 » 



„ 7 .•• 



Sept. 8/02 



3 



2 



5) 5 53 



3 m. 



» 7 ■•■ 



Oct. 18/02 



2 



3 



53 „ 



^2 " 



» y ••• 



Nov. 11/02 



2 



4 



55 '2 " 



^2 33 



15 13 



3. Doe C (bought April 18, 1902, under breeding age). 



To a May 17/02 2 2 About 2 m. At least 4 m. 



„ /3 July 2/02 3 - „ 3 „ „ 4 „ 



5 2 



4. Doe D (bought April 18, 1902, under breeding age). 







s. 



?. 



?. a- 



TO OL 



May 22/02 



1 



3 



About 2m. At least 4 m. 





July 1/02 



3 



2 



33 3 ,, ,, 4 



» 7 



Aug. 20/02 



4 



4 



„ 41 „ 2 m. 



» y 



Oct. 10/02 



4 



4 



55 U 55 °2 " 



33 a 



Nov. 25/02 



7 





„ 7 ,, At least 10 m 







19 



13 





5. 



Doe E (bought April 18 



, 1902, under breeding age). 







<?. 



?. 





To a 



May 26/02 



4 



4 



About 2 m. At least 4J m. 







4 



4 





