HEREDITY OF SAVAGENESS AND WILDNESS 291 



TABLE 2 



Results Of Successive Tests of Second Generation', F 2 , (Narrow X Wild) 



Hybrid Rats 



Rat Age Date Savageness Wildness Timidity 



52$ 75 days Jan. 24 3 2 



"31 1 1 



Mar. 11 



"18 



55$ 75 days Jan. 24 1 



"31 



Mar. 11 



"18 



64$ 80 days Sept. 27. 5 5 5 



Oct. 7 5 4 4 



56c? 75 days Jan. 24 3 2 



' " 31 2 2 



Mar. 11 1 1 



"18 1 1 



53c? 75 days Jan. 24 3 2 



"31 3 3 



Mar. 11 3 1 



"18 2 1 



62cT 80 days Sept. 27 ' 5 5 5 



Oct. 7 5 5 4 



grade attained in the first test for savageness; (f) in the last 

 test for savageness; (g) the average grade for all tests (that 

 is the 'average for the total number of tests given to the group). 

 The same three values are given also for wildness and for tim- 

 idity. Immediately below these averages appears the distribu- 

 tion of the rats in the grades o to 5. 



In tables 3, 4, 5, and 6 the results for males and females are 

 presented separately. Tables 3 and 4 present the results ob- 

 tained from the offspring of narrow tame by wild crosses; and 

 tables 5 and 6 those obtained from the offspring of wide tame 

 by wild crosses. 



It is apparent from table 3 that the F x narrow by wild indi- 

 viduals of both sexes grade high in savageness, wildness, and 

 timidity. Without exception, the females grade higher than 

 the males. Thus, the first test for savageness yielded the grade 

 of 4.39 for the females and 3.45 for the males. This result is 

 typical. The lower grades attained in the last test are note- 

 worthy. If we designate the grade which is most frequent as 



