inheritance; of fecundity in domestic eowIv. 373 



low fecundity class, because of an 'Under 30' record, although 

 they really carry L- and belong in the high fecundity class. vSucli 

 a state of affairs would account for just such discrepancies as 

 those observed in the matings under discussion. 



Mathtgs of Cornisk Indian Game males with Black and 

 Barred Fi females. Only one C.I.G. male was used in these P2 

 back-cross matings. This was C.I.G. $ 578. As will presently 

 appear, it is to be regretted that other Game males were not 

 used, because of certain peculiarities arising in the results of 

 some of these matings. From pure Cornish and P-^ matings $ 

 578 has been shown to have the gametic constitution fLL. fhh. 



Male 578 was mated with 3 black F^ females indicated to be 

 of the type fLiU. FFrA, with the following results: 



Matings: C.I.G. c? / hk f kk ^ Fi 2 fL^h FLJ2. 



2 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed i 9 i 



Expected 11 ■ 



Mean winter production 41 eggs 9.67 eggs eggs 



It will be noted that the one 'Over 30', bird laid but 41 eggs. 

 The record probably represents a fluctuation from the 'Under 

 30' class. In general the agreement between observation and 

 expectation is satisfactory. 



Turning to the matings of $ 678 with barred F-^ females we 

 meet the only case, in the whole investigation which is apparently 

 unconformable. It will therefore be well to discuss it in detail. 

 The facts are these : $ 578 was mated with four barred Fi fe- 

 males, of which three were in the 'Over 30' class and one was a 

 poor layer. When mated with any of these three high laying 

 birds one half of 578's daughters should have been in the 'Over 

 30' and one-half in the 'Under 30' class. Mated with the poor 

 layer only zero birds should have resulted. Nothing like this 

 actually happened. The observed outcome was that shown in 

 the following table : 



Mating 6gg ((^578 X ?4ii) gave 13 adult daughters, with winter 

 records as follows : 62, 60, 56, z^, I 30.- I 28, 27, 26, 26, 7, 5, 5, 2. 



Mating 700 (d'S78 X $422) gave 7 adult daughters with winter records 

 as follows: 47, 47, 33, [ 26, 19, 15, 9. 



