124 



GENETIC STUDIES ON A CAVY SPECIES CROSS. 



Table 71. 



Ratios of the average of measurement 9 to the average of measuremettt 11; and the averages of 

 the ratios of measurement 9 to measurement 11 in the individual shvMs. 



Table 72. 

 Totals of various classes of males tested by the different methods. 



Generation of male hybrids. 



Tested by 



breeding 



only. 



Micro- 

 scopic 

 test only. 



Tested 

 by both 

 methods. 



Total 

 breeding 



tests. 



Total mi- 

 croscopic 



tests. 



Total 

 number 

 tested. 



Fj, J wild 



Fj, J wild 



Fa, i wild 



Fi, ^wild 



Ft, 3^ wild 



F,, ^ wild 



F?, rk wild 



Fs, ii^wild 



Offspring of hybrid males and 

 females 



Offspring of hybrid males and 

 guinea-pigs 



Totals 



6 

 14 

 25 

 6 

 

 

 

 















7 



28 



55 



123 



45 



14 



1 



36 



22 



1 



1 



21 



44 



27 



4 



1 







3 







6 



15 



46 



50 



27 



4 



1 







3 







1 



8 

 49 

 99 

 150 

 49 

 15 



1 



39 

 22 



6 



22 



74 



105 



150 



49 



15 



1 



39 



22 



50 



331 



102 



152 



433 



483 



Table 73. 

 Results of a simple breeding test alone. 



