116 Segregation of Fecunditg Factors in Drosojyhila 



and have each segregated from the common pan: No deterioration 

 appears, as F,„ is higher than any preceding generation. 



The individuals from which Table III is prepared were descended 

 from four pairs apparently medium in size, while Table IV shows the 



TABLE III. 



BreecHny Record of Linf. III. {Medium in Size) 



Pair A Pair B Pair C Pair D 



F-i 81 72 79 84 « 



rn r^-i r^-i r^ 



F3 36 137 79 65 112 75 81 87 



II I I I I 



I I I I II 



n n 



Fi 31 60 78 142 72 86 34 77 65 121 68 82 87 144 150 138 



I I I I I I I I I I I I II II 

 Fji 24 71 74 lO'J 136 150 26 84 71 86 38 141 28 128 146 127 



II I I I I I I 

 Fo 19 68 138 68 42 54 28 86 



II ill! I I 



F^ 31 89 161 75 68 20 21 74 



II I I I I I I 



Fs 26 102 124 56 80 34 24 69 



II I I I I I I 



Fa 22 86 152 18 144 32 20 77 



II 1 I I I I I 



/•',„ 25 41 148 24 127 40 23 81 



TABLE IV. 



Breeding Record of Line IV. {Medium in Vigor.) 



