I\. TOYAMA 



37o 



Fi eggs 

 (Spring, 1909) 



Fj eggs 

 (Summer, 1909) 



^3 eggs 

 (Spring, 1910) 



TABLE V. 



( 9 formal x <J Grey). 



Normal divoUine white (one batch) 



Egg-bAtchea produced 



Number of 

 luatings 



6» 



Normal batdiea 

 13 



Grey batches 

 11 



Total 

 24 



Number of 

 Parent 



Normal 



Grey 

 



Number of 

 ToUls Parent Normal Grey B-grey ToUls 



6. 16" 

 6.18* 

 6.19» 



14 



7 

 7 



28 5 47 



11 8 26 



6 6 19 



Totals 



28 45 



I 

 Grey series 



19 



92 



6. 7. 3 I „ „ „ .- 6. 16. 12 ) 



(4 and 5) j ^ ^ o ii (5andl6))" 



16 



24 



* Parents of next generation. 



In the next generation paired inter se, both series again yielded 

 only normal- egged F^ batches, the number of batches produced in the 

 former series being 66 and in the latter 123. Now it is quite certain 

 that in these matings there is no grey factor which has lain dormant as 

 in the former matings. 



The facts obtained in these three series of experiments and those 

 from the second series of the line breeding suggest to us, firstly that 

 among the eggs of grey-batch No. 24, there are two kinds of grey eggs, 

 one having the grey factor in its zygotic composition, while another has 

 no grey factor, in spite of its being grey in colour; that is to say, some 

 grey eggs are heterozygous for the normal factor, some homozygous 



