58 CHARLES A. COBURN 



In the results of the tests of the 13 mice from Mating XI 

 ( 9 W-S X cf T-S) there is a contradiction of the results in 

 the preceding matings because, though both parents were 

 savage, 8 of the offspring were non-savage and 5 savage. 



From the last division of table 41 similar results to those 

 just noted in the preceding table may be seen to exist fairly 

 regularly throughout the matings from which came the F2b 

 hybrids. The exceptions in this table are found in Matings 

 IV, VII, and VIII. In Mating IV ( 9 W-S X cf T-N) the 

 savage and non-savage ofifspring are rather evenly proportioned 

 but the Wild exceed the tame by 6 to 1 . In Mating VI I ( 9 W-N 

 X (^ T-N) the non-savage are slightly more numerous than 

 the savage but, as in Mating IV, the wild are almost 8 times 

 greater in numbers than the tame. Likewise the 6 mice from 

 Mating VIII (9 T-N X c^ W-N) show practically opposite 

 results of inheritance since all 6 were in the w41d class and the 

 proportion of non-savage to savage was 1 to 5. 



In tables 42 and 43 the summaries of the tests of the Fsa 

 and Fsb hybrids are presented. Evidence that the grade of 

 wildness and savageness existent in the parent tends to pro- 

 duce a similar grade in the offspring is to be found in the re- 

 sults of Mating I of both tables, in the results for wildness and 

 tameness in Mating II of each table, and in Mating III of 

 table 42, in the results for savageness and non-savageness 

 in Mating IV, and also in the complete results of Mating VI 

 and VII of this same table. 



The exceptions in the case of Mating IX ( 9 T-N X cf T-N) 

 of both series and of Mating X ( 9 T-N X cf T-S) of Series A 

 (table 42) are interesting inasmuch as the number of wild in 

 the offspring is in excess of the number of tame although both 

 parents were in each case classed as tame. The number of 

 savage individuals exceeds that of the non-savage in Mating IX 

 although both parents were non-savage. This is likewise true 

 in Mating VIII ( 9 T-N X d^ W-N). 



Mating I and Mating II are the only ones which appear 

 throughout both series of the two hybrid generations. The 

 results of these matings are presented in table 44 in order to 

 enable a more comprehensive comparison. The blending 

 heritable tendency that has been mentioned above may be 

 more clearly noted in this table. It is rather well defined 



