234 KAYMOND PEAKL 



whenever one individual in a family is physiologically abnormal 

 in this way all the other members will usually show the same con- 

 dition in greater or less degrees. 



In the F2 generation following the reciprocal crossing of Barred 

 Rocks and Cornish Indian Games there are a number of possible 

 matings. The nature of these matings and the results as to color 

 and pattern have been discussed in another place (41). That 

 paper may be referred to in case one is not clear as to the nature 

 of the matings. The different matings will be discussed in the 

 following order. 



1. F, ^ (out of B.P.R. c^ X C.I.G. 9) XF, 99, barred and 

 non-barred. 



2. F, cf (out of C.I.G. c^ X B.P.R. 9) XF, 99, barred and 

 non-barred. 



3. Fi ^ (out of B.P.R. cf X C.I.G. 9) X B.P.R. 9 9 



4. /^ cf (out of B.P.R. ^ X C.I.G. 9) X C.I.G. 9 9 



5. F, cf (out of C.I.G. d^ X B.P.R. 9) X B.P.R. 9 9 



6. F, d' (out of C.I.G. d X B.P.R. 9) X C.I.G. 9 9 



7. B.P.R. dd X F, Barred 9 9 



8. B.P.R. dd X Fx non-barred 9 9 



9. C.I.G. d X Fi 9 9 Barred and non-barred 



It will be recalled that the barred Fi females come from the 



mating B.P.R. d X C.I.G. 9i and that the non-barred (black) 



Fi females comes from the reciprocal mating C.I.G. d X B.P.R. 9 . 



Matings of Fi & 576 ivith Fi females. The pedigree of i^i & 576 



was as follows: 



B.P.R. d 559 (fhL^ . fUL,) x C.I.G. 9 456 (fLJ. • Fm 



i 

 F, d 576 



The hereditary constitutions of both d 559 and 9 456 were 

 known, both from their pedigrees and their progeny in other 

 matings. From this pedigree it is evident that the gametic 

 formula for d 576 must be either /Z1L2 . fLiU or/ZiLa . fhk. A 

 study of his progeny in all matings shows clearly that it is actually 

 the former. In other words he produced gametes of four kinds, 

 viz., fliL2, fL.Lo, fLxk, flik- 



