BULLETIN No. 205. 



THE MODE OF INHERITANCE OF FECUNDITY IN 

 THE DOMESTIC FOWL' 



RAYMOND PEARI, 



Contents 



Introduction 284 



Biological analysis of the character fecundity 285 



The anatomical basis of fecundity 295 



The mechanism of the inheritance of fecundity 302 



Observed types of winter egg production 302 



Symbolic analysis 304 



Analysis of the experimental data ' 308 



Barred Plymouth Rock matings 313 



Matings of Barred Plymouth Rock males of class 7 314 



Summary and discussion of matings of class 7 Barred Ply- 

 mouth Rock males 328 



Matings of Barred Plymouth Rock males of class 4 332 



Summary of results of matings of class 4 males 336 



Matings of Barred Plymouth Rock males of class 3 337 



Matings of Barred Plymouth Rock males of class 2 340 



Summary of results of all matings of class 2 males 342 



Matings of a Barred Plymouth Rock male of class 8 344 



Matings of a Barred Plymouth Rock male of class i 345 



Doubtful cases 346 



Summary of results of all pure Barred Rock matings 348 



Cornish Indian Game matings 349 



Matings of a Cornish Indian Game male of class 2 350 



Matings of a Cornish Indian Game male of class 3 351 



Summary of results of Cornish Indian Game matings 352 



Reciprocal crosses of Barred Plymouth Rocks and Cornish In- 



^ Papers from the Biological "Laboratory of the Maine Agricultural 

 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, 191 1. The present paper was first published in the journal 

 of Experinienlal Zoology, Vol. 13, No. 2, August 1912, pp. 153-268. 



