THE MODE OF INHERITANCE OF FECUNDITY IN 

 THE DOMESTIC FOWL^ 



RAYMOND PEARL 



THREE FIGURES 



CONTENTS 



Introduction 154 



Biological analysis of the character fecundity 155 



The anatomical basis of fecundity 165 



The mechanisiii of the inheritance of fecundity 172 



Observed types of winter egg production 172 



Symbolic analysis 174 



Analysis of the experimental data 179 



Barred Plymouth Rock matings 184 



Matings of Barred Plymouth Rock males of class 7 185 



Summary and discussion of matings of class 7 Barred Plymouth Rock 



males 200 



Matings of Barred Plymouth Rock males of class 4 204 



Summary of results of matings of class 4 males 208 



Matings of Barred Plymouth Rock males of class 3 210 



Matings of Barred Plj^mouth Rock males of class 2 213 



Summary of results of all matings of class 2 males 215 



Matings of a Barred Plymouth Rock male of class 8 216 



Matings of a Barred Plymouth Rock male of class 1 217 



Doubtful cases 219 



Summary of results of all pure Barred Rock matings 220 



Cornish Indian Game matings 222 



Matings of a Cornish Indian Game male -of class 2 222 



Matings of a Cornish Indian Game male of class 3 223 



Summary of results of Cornish Indian Game matings 224 



Reciprocal crosses of Barred Plymouth Rocks and Cornish Indian Games 



Fi generation 225 



Matings of Barred Plymouth Rock males and Cornish Indian Game 



females 225 



Matings of Cornish Indian Game males and Barred Plymouth Rock 



females 227 



^ Papers from the Biological Laboratory of the Maine Experiment Station No. 

 37. An abstract of this paper was presented at the meeting of the American 

 Society of Naturalists in Princeton, N. J., December, 1911. 



153 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 13, NO. 2 , 



AUGUST, 1912 



