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. 



Range of index. 



Totals. 



l.gl 



2.gl 



3.gl 



4. g II 



5. g I 



6. g I 



7.gri 



8. g I 



9. g I 



10. g I 



11. g I 



12. g I 



13. g I 



14. g I 



16. g I 



16. g I 



17.gl 



M. 2. g I . . . . 

 M. 2. g 1(A) 

 M, 2. g 1(B) 

 M. 2. g 1(C) . 



2.761 

 2.749 

 2.560 

 2.739 

 2.670 

 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 



^2.754 



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. g II .... 



2.gn .... 



S. gll .... 



4. g n .... 



5. g II .... 



6. g II .... 



7. gn .... 



8. gn .... 



9. g n .... 



10. g II . . . . 



11. g II .... 



12. g II . . . . 



13. g II .... 



14. g n .... 



15. g II .... 



16. g II 



17. gn 



M. 2. gn ... 



M. 2. g n(A) 

 M. 2. g n(B) 

 M. 2. g n(C) 



If. 



(M. 

 )F. 



\f. 



If. 



(M. 



If. 



(M. 



If. 



(M. 



If. 



(M. 



If. 



f M. 



If. 



(M. 



If. 



f M. 



If. 



(M. 



If. 



CM. 



If. 



(M. 



If. 



f M. 



If. 



fM. 



If. 



JM. 



If. 



f M. 



If. 



fM. 

 (F. 

 (M. 



If. 



4 



7 



22 



19 



21 



5 



19 



24 



5 



16 



5 



6 



10 



5 



4 



8 



14 



6 



2 



7 



6 



4 



6 



6 



1 



3 



11 



14 



39 



40 



1 



5 



6 



12 



117 



48 



9 

 5 

 8 

 6 

 1 



417 

 46j 



87 



\%] «!' 

 114? 



79) 

 172) 

 103) 



65] 



81] 



431 



59] 



53 



61 



193 



275 



146 



102 



114 



52) 



49) 



81) 



76) 



461 



49 



57 



54 



57 



56 



101 



157 



i 



! 



14) 

 24) 

 53) 

 62) 



153 



162 



235) 



188) 

 21) 

 31) 

 57) 

 61 1 



650) 

 562) 



50) 

 76) 

 71) 

 73) 

 36) 

 42f 



95 



111 



113 



38 



315 



62 



118 



1212 



126 



78 



Total. 



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

 either primarily or even partly responsible for the condition found 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- 



