308 MAINE AGRICULTURAL EXP^RIMLNT STATION. I912. 



Turning our attention to the Cornish Indian Games, we have 

 the gametic constitutions set forth in tables 7 and 8. The only 

 special point to be noted here is that the factor Z".,: does not 

 appear at all in either males or females. All the evidence indi- 

 cates that in the strain of Cornish Indian Games used in these 

 experiments, this excess production factor I,- is entirely absent 

 (cf. in this connection tables i, 2 and 3, supra). 



We may next consider the theoretical results which. would be 

 expected to follow the mating in all possible combinations of 

 birds of the constitutions set forth above. In doing this account 

 will be taken of female progeny only, for the sake of simplicity, 

 saving of space, and because we are here concerned only with 

 actual fecundity as expressed in the female. Anyone who de- 

 sires can easily work out the $ constitutions for himself. Ta- 

 bles 9 and 10 give the expected numbers of female progeny 

 from each mating, on the assumption of uniform fertility 

 throughout. It will be seen that some odd ratios should appear. 



It should be pointed out that while, for the sake of complete- 

 ness, the result of every possible mating is carried out in table 

 9 on an assumption of ecjual fertility for all matings, this by no 

 means accords with actual fact. Certain of the matings would 

 not in practice get any offspring at all. This applies also to 

 table 10. This point will be made clear in connection with the 

 application of the theoretical frequencies to the observed .data. 



It will not be necessary in the table for Cornish Indian Games 

 to present the theoretical frequencies in such detail. Only totals 

 and ratios will be given. 



From table lo it will be seen that no high layers are to be 

 expected from pure Cornish Game matings and that further the 

 proportion of zero layers is relatively high. 



Analysis oe the Experimental Data 



In this section the actual results in respect to fecundity will 

 be compared with the theoretical expectations. There will be 

 presented first the data respecting the matings of Barred Rock 

 males and females (pure B.P.R. matings) ; second the data 

 respecting matings of Cornish Indian Game males and females 

 (pure C.I.G. matings) ; and finally the F-: and F-. matings of 

 Barred Plymouth Rocks and Cornish Indian Games crossed 

 reciprocally. 



