226 



The Mechanism of Evolution" in Leptinotaesa 



the characteristics, as do similar conditions produce like ranges in characters 

 of non-organized matter; and (c) it is possible that the range is due to many 

 small actual differences in the constitution — " germinal variations " — which 

 the methods used or the criteria of the index used are not able to separate out 

 into the component groups. 



Table 29. 



No. of mating. 



Parents, 

 index. 



Progeny. 



Fraternity No. 



to 



Range of index. 



Totala. 



gl 



gl 



gl 



gll 



gl 



gl 



gl 



gl 



gl 



gl 



gl 



gl 



gl 



gl 



gl 



gl 



gl 



2.gl 



2. gI(A) ... 

 2. g KB)... 

 2. gI(C) .... 



2.761 

 2.749 

 2.560 

 2.739 

 2.570 

 2.790 

 2.738 

 2.529 

 2.619 

 2.700 

 2.752 

 2.689 

 2.766 

 2.969 

 2.580 

 2.900 



2.600 



r2.951 



2.600 



L2.754 



2.630 

 2.594 



2.785 



2.599 

 2.931 

 2.751 

 2.760 

 2.771 

 2.870 

 2.731 

 2.700 

 2.901 

 2.791 

 2.898 

 2.894 

 2.715 

 2.769 

 2.763 

 2.715 



2.825 



2.700 

 2.815 

 2.749 



2.911 

 2.715 

 2.826 



1. gll .... 



2.gn .... 



S. gll .... 



4. g n .... 



5. gll .... 



6. gn .... 

 7.gn .... 



8. g II .... 



9. gn .... 



10. g u .... 



11. g n .... 



12. g II . . . . 



13. g II .... 



14. g n .... 



15. gll .... 



16. g II 



17. gn 



M. 2. gn ... 



M. 2. g 11 (A) 

 M. 2. g n(B) 

 M. 2. g 11(C) 



{?; 



JM. 

 IF. 



!^; 

 !^: 



fM. 



If. 



(M. 



If. 



fM. 



If. 



(M. 



If. 



!^; 



JM. 

 IF- 



{?; 



(M. 



If 



(M. 



If. 



fM. 



If. 



f M. 



If. 



fM. 



If. 



f M. 



If. 



JM. 

 IF. 



If: 



11 



10 

 46 

 4: 

 20 

 17 

 46 

 13 

 13 

 14 

 13 

 17 



9 

 24 



9 

 11 

 17 

 21 



9 

 15 

 16 

 16 

 16 

 19 



4 



7 

 48 

 47 

 61 

 47 



3 



4 

 14 

 11 



122 

 151 



7 



11 

 24 

 25 

 11 

 12 



417 

 46 J 



87 



154) 

 159 j 



114 1 

 79 j 



l'^2l 275 

 103 J ^'^ 



651 

 81] 

 431 

 59] 

 531 

 61 ; 

 52] 

 491 



313 



193 



146 



102 



;jii4 



101 



157 



95 



111 



461 

 49 j 



571 

 54 j 



tl] ^^3 



38 



14) 

 24) 



21) 

 31 J 

 57) 

 611 



52 



118 



6501 

 562] 



50) 

 76) 

 71) 

 73) 

 36) 

 42f 



1212 



78 



Total 4113 



The first attack was made to determine whether the " environment " was 

 either primarily or even partly responsible for the condition foimd in the range 

 exhibited in the index. For this, therefore, I set up 12 breeding-tanks of the 

 construction and arrangement of control shown in figure 32 (Chap. I), and 

 arranged to give constant conditions of temperature and moisture, air-move- 



