STUDY OF SELECTIONS FOR SIZE, SHAPE, AND COLOR OF HENS' EGGS 271 



separately, and for each four-weeks period a figure was obtained to rep- 

 resent x in the following ratio: 



Female weight : male weight :: x : 1 



LA. list of all such constants obtained is shown in table 61. In studying 

 [correlations for the weeks shown in table 61 for the 1911 offspring, and 

 [for the one-day-old period of the 1912 offspring, the male weights were 

 multiplied by their respective constants and used with the female 

 [weights. After the above periods, and for all other offspring, no male 

 weights were used. These constants correspond rather closely to the con- 

 stant 0.93 representing the same ratio for human stature in mature per- 

 sons, found by Galton. 11 



Relation between size of the chick and size of the egg from which it was hatched 



A preliminary study was made of the 1911 and 1912 offspring, before 



the records for the later years were available, to determine the relation 



between the size of the chick and the size of the egg from which it was 



8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 138 144 152 160 168 176 184 192 200 208 216 224 

 - K 4 12 20 28 36 44 52 60 68 76 84 92 100 108 lift 124 132 140 148 156 164 172 180 188 196 204 212 220 



FlG. 43. GRAPHIC RECORD OF ~ FOR 19! I OFFSPRING, igi2 OFFSPRING, AND ALL BIRDS 

 AVAILABLE DURING THE PERIOD OF THE EXPERIMENT 



Sizes of birds at four- weeks periods during their life, subject; sizes of eggs from which the respective 

 chicks were hatched, relative 



11 Galton, Francis. Natural inheritance, p. 78. 1889. 



