R C. PUNNETT AND P. G. BaILEY 31 



above bantam size, weighing 825 grams, while the hens were respectively 

 620 and 650 grams. The progeny showed a good deal of variation (e.g. 

 Table I). A few were of the smallest bantam size, others were near 

 the parents, while a few were distinctly larger. Two of the cockerels 

 for instance were between 900 and 1000 gi-ams while one of the pullets 

 was over 800. The result shows that birds which are not quite of 

 bantam size may give both birds distinctly larger and others as distinctly 

 smaller than themselves. 



The Hamburgh Sebright x Bruvm Legliorn. Cross. 



These experiments were made primarily with the object of following 

 up the transmission of the female form of plumage that may occur in 

 cocks. They offer also some interesting data in connection with the 

 inheritance of size which may be considered here. The ^ J' alone were 

 reared, and as they generally show their type of feathering at 6 months 

 old they were for the most part killed at that age. Had we been able 

 to keep them for a further 3 months it is probable that the larger birds 

 would have grown relatively more than the smaller ones. With Brown 

 Leghorn hens were crossed F^ ^ ^ and two large F„ ^ ^ (Nos. 28 and 

 139 of 1912) whose weights, 1200 and 1250 grams respectively, were 

 those of i^i birds. A few birds were also raised from an i^, % mated 

 with a Brown Leghorn ^. Similar results were obtained in all of the 

 above cases (cf Table I) and they may conveniently be considered 

 together. The figures have been put into the form of a curve in Fig. 2 

 (on p. 32). It is evidently bimodal. What is of peculiar interest is that 

 one of the modes, the higher, jDractically coincides with that of the pure 

 Brown Leghorn, while the lower one is the same as the single mode 

 on the curve got from the crossing of Brown Leghorn ,/ with two small 

 F« $ ^ . The bearing of this will be considered later. 



Hamburgh-Sebright x Bantam- Leghorn. 



We have already mentioned that in 1910 we failed to breed any 

 F^ %% from the Hamburgh-Sebright cross. Of the two F., ^ ^ bred 

 that year one was put to Gold Sebright $ % as stated above, and 

 the other was run with two hens which had resulted from an artificial 

 cross between a White Leghorn and a bantam \ They were nearly of 

 the same weight, one being 1020 and the other 1040 grams. 29 birds 

 were produced from the pen (Pen 4, 1911), viz. 16 (/'(/ ranging from 



' These two hens were given to Professor Bateson in 1908 by Dr Hagedoorn, who 

 stated that they were made by artiticially inseminating a bantam ben with the sperm of a 

 White Leghorn cock. The nature of the bantam used is unknown. 



