18 CHARLES A. COBURN 



Of the five averages included In the tables, the average of 

 all the tests and the average of the third, fourth, and fifth tests 

 seem to present the most accurate estimates of the degree of 

 wildness or savageness of the mice, because the number of 

 tests included in these averages tends to counteract the effect 

 of any extreme grade of wildness and savageness or tameness 

 and non-savageness that may have been received in an occa- 

 sional test due to the influence of some extraordinary conditions 

 upon the mouse or the experimenter or both at the time of the 

 test. Of these two averages, that of the third, fourth and fifth 

 tests is probably the more reliable measurement of the traits 

 in question. This is because there is included in the average 

 of all tests the results of the first two tests which are consid- 

 ered to give an exaggerated estimate of the wildness, and per- 

 haps also savageness, possessed by the mouse on account of 

 the possible effect, in the case of the first test, of the experience 

 of being handled for the first time ; and, in the case of the second 

 test, because of any effect which may remain from the more 

 or less painful experience of being numbered immediately after 

 the first test is made. The fact that the lowering of the grades 

 of wildness is greater between the second and third tests than 

 between any other two successive tests seems to support this 

 statement (table 12, page 23). 



Using the average of all tests and the average of the third, 

 fourth and fifth tests as criteria, the arrangement of the genera- 

 tions of Series A with respect to grades attained in wildness 

 and savageness is (1) F3, (2) Fi, (3) F2, where one represents 

 the highest grade and three the lowest grade. This order of 

 arrangement is maintained when the degree of wildness of the 

 generations of Series B is considered, but the order of this series 

 with respect to savageness is (1) F3, (2) F2, (3) Fi. 



The modal grade for wildness is either 3 or 4 in all the genera- 

 tions of both series except F2a where it ranges from 2 to 4. 

 The modal grade for savageness is either 3 or 4 in Fia and either 

 4 or 5 in Fsb. In the case of Fsa, Fib, and Fab, it ranges from 

 3 to 5, and in F^sl the range is from to 5. 



In tables 6, 7, and 8, the results for the males and females 

 of each generation of Series A are presented separately, and in 

 tables 9, 10, and 11, those of Series B are shown. 



The averages for the males and females of Fia (table 6) in- 

 dicate but little difference in the grades of wildness and savage- 



