SEX-RATIO OF THE DEER-MOUSE. 



135 



respectively being plotted separately. Here again, the numbers 

 comprised in some of these groups were so small that the graphs 



o 



o 

 o 



FIG. 5. Seasonal variations in the sex ratio, for small (i to 3) and large 

 (4 to 9) broods respectively. Continuous line = large. Broken line = small. 



