THE AMEBIC AN NATURALIST [Vol. XL VIII 

 TABLE II 



YVM. . . 

 YVR. . . 

 YVBr J . . 

 WVM. . 

 WMR. . . 

 W M Br' 



WVM. 

 WMR.. 



wmh ■ 



It will be seen that in every case the calculated value 

 for the secondary reduplication is higher than the ob- 

 served value. The same relation comes out in two experi- 

 ments which I have done involving genes of another 

 group in Drosophila (see Table VIII, Sturtevant, '14). 

 Punnett's case is so involved that calculations accurate 

 enough for our present purpose can not be made. In 

 Gregory's experiment one of the genes (M) could not be 

 followed in all the plants because masked by another gene. 

 We are not given the data for 8 and G in those plants in 

 which M was classified separately from those in which it 

 was not. The data are therefore not available for exact 

 calculations, since the numbers are too small to overcome 

 chance deviations. The data for my own two experi- 

 ments appear in Table IV. 



The same relation comes out more strikingly in another 

 way. If we let m equal the intensity of the AB series and 

 n that of the BC series, then on Trow's special hypothesis 



