286 Sturtevant. 



Table XX. Double Crossing over in Chromosome II. 



BvgCv bvgcvcf 



bVgov " ^ 



BVgCv BVgcv Bvg bVgCv bVgcv b vg 

 s 10 30 3 53 11 



m 1 26 95 9 84 32 



Total 1 m 125 12 137 43 



Bvgcv Q ,. bvgcvcf 

 bVgCv^ ^ 



BVgCv BVgcv Bvg bVgCv bVgcv bvg 



m 54 1 94 143 18 34 



BCvSp ^bcvspcf 

 b c V sp 

 BCvSp BCvsp BcvSp Bcvsp bCvSp bCvsp bcvSp bcvsp 

 s 58 24 5 24 27 7 35 43 



Tables XXI. Crossing over in females, Chromosome HI. 



Peb ^ pebcT 

 pEb " -^ 

 PEb Peb pEb peb 



m 2 208 213 2 



s 1 342 363 2 



Table XXII. Backcross tests of males, Chromosome III. 



Total (I 20 38 



