DEATH IN UTERO OF MOUSE 

 TABLE V 



As previously stated, Cuenot, and Castle and Little 

 noted that the average number per litter is less from yel- 

 low females mated to yellow males than from any other 

 type of mating. Our results, summarized in Table VI, 

 bear this out. Here it will be noted that the average num- 

 ber of living embryos is less for mating 1 than for any 



TART.E VI 



of the other types of matings singly or combined. It is 

 evident that the average number of living embryos per 

 litter represents those which would in the regular course 

 of events have been born alive. In the yellow X yellow 

 mating the average is only 6.15,^ while for tlio otlior mat- 

 ings combined it is 7.63. The average uuihIxt when tlir 

 dead embryos are also included should be apitroxiniatt ly 

 the same in both cases, and this proves to he tnie. l>eing 

 8.27 for yellow X yellow and 8.47 for all other matings. 



