504 



University of California Pi(hlications in Zoology [Vol. 13 







TABLE J 



[III 









Extra X 



lOXTRA MatINUS, 



, Serially 



Arranged 





Actual 



ratios 

 to 1 



2.35:1 



Actual 

 numbers 



33:14 



Actual 

 ratios 

 to 1 



5.0:1 



Actual 

 numbers 



15:3 



Actual 



ratios 



to 1 



11:1 



Actual 



numbers 



55:5 



3.2:1 



23:7 



5.2:1 



21:4 



12.5:1 



88:7 



3.4:1 



13:3 



5.6:1 



90:16 



14:1 



70:5 







5.7:1 



46:8 



14.5:1 



58:4 







7.5:1 



75:10 







3:1 





5:1 





15:1 





TABLE XIV 



Normal X Normal Matings, Serially Arranged 



Actual 



ratios 



to 1 



Actual 

 numbers 



Actual 



ratios 



to 1 



Actual 

 numberi 



19.6:1 



98:5 



47.5:1 



95:2 







75:1 



75:1' 



15:1 





63:1 





In addition to the above results of matings in paii^s. it seems worth 

 while to include the offspring of mass cultures merely to show that 

 they give similar ratios, although these ratios cannot be further an- 

 alyzed and it might be expected that some of them at least would 

 represent the combination of offspring from unlike matings. 



In table XV are shown the results of breeding together in mass 

 culture normals which had been derived from a cross between normal 

 and extra. 



TABLE XV 



Normals from First Crossing with Extra, bred to Normals in Mass Culture 



Through Five Generations 



Ratios 



Ratios 

 to 1 



101:13 



7.5:1 



105:1 



105:1 



127:2 



63.5:1 



85:2 



42.5:1 



75:1 



75:1 



100:3 



33.3:1 



85:3 



28.3:1 



Expectation 



Agreement 



Conclusion 



99.7:14.3 



7:1 



7:1? 



104.3:1.7 



63:1 



63:1 



126.09:2.01 



63:1 



63:1 



85.6:1.4 



63:1 



63:1 



74.8:1.2 



63:1 



63:1 



101.4:1.6 



63:1 



63:1 



82.5:5.5 



15:1 



15:1 



In table XVI are shown the results of breeding together in mass 

 culture normals which had been extracted from a cross between two 

 extras. 



