inheritance; of i^ecundlty in domestic eowIv. 32^" 



D. With I ? indicated to be of class 4 := jLJ';.. PLiL. 



? Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 5 o I 



Expected 6 ' o 



Mean winter production of $ ? 



in indicated class 3940 eggs o eggs- 



All 2 Progeny 



Winter Production: . Over 30 Under 30 Zero 



Observed 57 29 2 



Expected 62 26 



Mean winter production 48.16 eggs 13.81 eggs o eggs 



Besides the families noted above $ D31 got one adult daugh- 

 ter by each of two other females. Both these daughters had a 

 winter record of zero eggs and were apparently pathological. 

 In any event it was impossible to form any judgment as to their 

 gametic constitution or that of their dams. 



The general agreement between observation and expectation 

 in this large progeny group is clear. The apparent exceptions 

 to gametic expectation need some discussion. In the B ma tings 

 (class 2 9 2) the record shows 2 1-2 in the 'Under 30' class 

 where none is expected. Actually out of the 30 individuals from 

 these matings only one daughter laid fewer than 30 eggs in the 

 winter period. There were, however, 3 individuals which laid 

 exactly 30 eggs in this period. .So, in accordance with the con- 

 vention adopted at the beginning, the record of 2 1-2 is made 

 up as follows : i -j- 1-2 -\- 1-2 -\- 1-2 ■= 2 1-2. The one bird 

 under 30 with a record of 17 eggs was late hatched and proba- 

 bly represented a somatic fluctuation. This bird was bred, but 

 unfortunately got no offspring. Her eggs were nearly all fer- 

 tile but the embryos died during incubation. 



Of the two birds with a zero winter record it may be said that 

 one (E96) was pathological, and on that account failed to lay. 

 The autopsy on this bird, which died April 13, 1909, showed 

 that it must have been functionally deranged for a long time 

 preceding death. Yet there was clear evidence of functional 

 activation of ovary and oviduct at some time before death. In 

 this case the bird without question carried either Li or La (or 



