TABLES. 



127 



Table 78. 

 Different comhinalions of matings which have been made. 



Table 79. 



Percentages of hybrid male offspring with many motile sperm in malings of female hybrids 

 with guinea-pigs, and female hybrids xvilh male hybrids. 



Offspring of female hybrids Offspring of female hybrids 

 and guinea-pigs. and male hybrids. 



Generation 

 of females. 



Percentage ' Percentage 



Number, i with many | Number. with many 

 motile sperm. motile sperm. 



Table 80. 

 Average number of young per litter in the wild and tame parents and in the hybrids. 



Generation. 



Total Number of | Average 

 individuals. litters. | per litter. 



Wild 



Tame 



Tame (Minot's results) 



Tame females by wild males . . . . 



Fi. \ wild 



Fj, \ wild 



F3, i wild 



F4, i^wild 



Fs, 3*2 wild 



Fe, eV wild 



46 

 484 

 366 



37 



S3 

 217 

 312 

 344 

 122 



36 



34 



207 



143 



16 



52 



114 



152 



172 



60 



19 



1.35 

 2.34 

 2 56 

 2.31 

 1.60 

 1.90 

 2.05 

 1.98 

 2.03 

 1.89 



