Analysis of Heterogeneity in the Population 303 



and observation in nature can suggest possible solutions, but can solve none with- 

 out the aid of analytical experiment. 



In the following season (1908), the population was examined with much 

 interest in the first generation to see if the condition prevailing in the previous 

 season persisted into the following generations. The census of the first gener- 

 ation showed that the line of biotypes 1, 2, 3, and 4 were present in full in both 

 sexes and strongly developed, as were 5, 6, and 8. In the 9, 10, 11, and 12 series 



65-^^^ 45 38~ijh:,. 58 



41-fr-^^ V-^, ^ 106 — <i^ I ;^--96 



106-- -^^;^ %- ^. -81 71 ;^ 



7i -rm4 '^^ 106 ^. .^ 



61 '#%. ^ ^ ^' 



JS*'' #- 318 92 ^ inn'— 



161 



— - 219 



341 



497 



/ / /"^y-^-- — -2H / / '^ ^fi^ 293 



/ / / ** ^\ - i^ T--— 96 / / / <Mf \ 



31 92 77 4 21 19 12 39 44 5 21 46 



2232 Males. Total 4936. 2704 Females. 



Fig. 109. — Census of first annual generation at Puebla in 1908, showing a sharp 

 increase in the array in the population, with the presence of two added isolated 

 groups in both males and females. 



108-i^-iift, 106-p^ll^^ I ^^-85 



S_245^ ^^^^^-73 ioi--^i;;5t ^;i 



71 "^||| ^ 9* -^i^l^'i 



69—- J^ 46 ^:pj| 



86 ^ j^_ 219 ^2 ^#> .^ 244 



"^^^ ^-^- 618 ^0^^^^mmr -496 



/ / X** ^:^ 219 / / M|N»?K- 277 



t v'f^'P*,^ / / iimmk^^^ 89 



j j /m-^x / / fm?^\^ 



71 44 45 HJ 14 31 9 47 31 19 21 44 



2450 Males. Total 5018. 2568 Females. 



Fio. 110. — Census of second annual generation at Puebla in 1908, showing array 

 and increased development along the line composed of biotypes 1, 2, 3, and 4, and 

 isolated groups in 10, 11, and 12. 



there was decided derangement, 10 being isolated in both, 11 in the males, and 

 13 in the females as distinct groups. In the second generation the same condi- 

 tion prevailed in the population, with the exception that 10 was absent in the 

 males and only present in the females as a small group, while 11 was present 

 in the males and 12 in the females. Otherwise the distribution of the popula- 

 tion was uncommonly well developed. These conditions are shown in figures 109 

 and 110. In this season the conditions of the previous one were repeated, but 



