Full text: papers communicated to the first International Eugenics Congress held at the University of London, July 24th to 30th, 1912

R. Pearl.Biology and Eugenics.55 
Table II. 
Showing some Results of Mating together Barred Plymouth Rock Males and 
Barred Plymouth Rock Females with different combinations of 
Fecundity Genes. Summarized Data. 
Matings.Distribution of daughters in respect to 
winter egg production. 
Class.Over 30.Under 30.Zero. 
<? iL1L2. fi ! 12 x ?fL1L2 . Fi1i2Observed21308 
(High producer)Expected22' 12957'4 
Average winter egg production in each class48-85 eggs16-34 eggsO eggs 
<f fLjL^• -^1^2  ^Î fLiL2 . FLti2Observed21J*164O 
(High producer)Expected*9190 
Average winter egg production in each class ...50-38 eggs16-69 eggs— 
$ iLxL2. fixi2 x ¥ ¥ of all typesObserved5ii62!II 
taken together.Expected51-4562‘511-05 
Average winter egg production in each class47 "94 eggs15’34 eggs0 eggs 
& fi  ^L2. fiiLg x î fLxLa . Fiji,,Observed92j10347 
(High producer)Expected1015101-50 
Average winter egg production in each class54-19 eggs15’52 eggs0 eggs 
f 1^ L*2. fiiLj x ? fLxL2 . FLji'jObservedin60 
(High producer)Expected11700 
Average winter egg production in each class56-47 eggs20-33 eggs— 
S fliL2. fi1L2 x ?fL1i2 . FTjIjObserved29232 
(Low producer)Expected27270 
Average winter egg production in each class ...47 '93 eggs15'3° eggs0 eggs 
S fijL2. flxL2 x ? ? of all typesObserved24314910 
taken together.Expected2555146-50 
Average winter egg production in each class ...53'67 eggs15'37 eggs0 eggs 
S fL1L2. fi1L2 x ?fL1L2 . FijisObserved2063 
(High producer)Expected21'757'250 
Average winter egg production in each class ...56-90 eggs24‘17 eggs0 eggs 
<?fL1L2. fLjij x ? ? of all typesObserved19160 
taken together.Expected1751750 
Average winter egg production in each class ...5 5'47 eggs18-31 eggs— 
<rfiiL2. fijla x ¥ ¥ of all typesObserved841545 
taken together.Expected10-23i454'25 
Average winter egg production in each class ...60-50 eggs12-26 eggs0 eggs 
* The records of \ refer to birds whose winter production record was exactly 30 eggs. Each 
one of the few birds of this sort is divided between the “ Over 30” and the “ Under 30” classes.
        

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