124 



GENETIC STUDIES ON A CAVY SPECIES CROSS. 



Table 71. 



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

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



Table 72. 

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



Generation of male hybrids 



Tested by] Micro- 

 breeding i scopic 



Tested I Total | Total mi- Total 

 by both j breeding [ croscopic number 



only, j test only, i methods. ] tests. 



tests. tested. 



Fi, I wild 



F2, i wild 



F3, 5 wild 



F4. iV^-i'd 



F5, 3*2 wild 



Fe, 6'4 wild 



Ft, ile wild 



Fs. ihe wild 



Offspring of hybrid males and 

 females 



Offspring of hybrid males and 

 guinea-pigs 



Totals 



5 

 14 

 25 

 6 

 

 

 

 



50 







7 



28 



55 



123 



45 



14 



1 



36 



22 



331 



1 



1 



21 



44 



27 



4 



1 







3 







102 



15 



46 



50 



27 



4 



1 







3 







1 



8 



49 



99 



150 



49 



15 



1 



39 



22 



152 



433 



22 



74 



105 



150 



49 



15 



1 



39 



22 



483 



Table 73. 

 Results of a simple breeding test alone. 



