112 MAINE AGRICUI^TURAI. EXPERIMENT STATION. I9IO. 



were apparently dealing with a heterozygote individual in re- 

 gard to comb the figures Avere as follows : — Mating 426 pro- 

 duced II adult offspring distributed, as to comb condition as 

 follows : Males, 2 perfect single, 2 intermediate, i perfect pea ; 

 females, 3 perfect single, 2 intermediate and i pea. Putting 

 the intermediate and pea together as showing he pea charac- 

 teristic in some degree, we have for the total 5 perfect singles 

 and 5 peas or intermediate peas produced in this family. This 

 is in exact accord with Mendelian expectation on the suppo- 

 sition that in this family we are dealing with a heterozygous 

 Cornish Indian Game female as the mother. Whether this is 

 the true explanation of the occurrence of single combs in this 

 family is not, of course, absolutely certain. 



The character of the single combs obtained in this family is 

 shown in Fig. 79. 



Fig. 79. Photograph of head of hybrid ^ showing perfect single comb. 



The explanation of the occurrence of single combs through 

 a heterozygous condition of one parent by no means holds for 

 all matings where such combs were obtained. In the other 

 matings producing single combs besides 426 there would usu- 

 ally be only one or two single-combed birds out of a family of 

 10 to 20 peas or intermediates. 



4. Detailed data regarding the condition of the comb in 

 these hybrids may next be considered. From the three matings, 

 420, 422, and 587, there was obtained one perfect single-combed 

 offspring in each case. All of the other offspring of these 

 matings had either perfect or intermediate pea combs. From 

 matings 419, 421, 424, 428, 429, 443, 445, 461 and 589, there 

 were recorded one or more combs in each case as "nearlv 



