328 APPENDIX 



All were sown the following year. Eleven of the round yellow seeds 

 did not yield plants, and three plants did not form seeds. Among 

 the rest: 



38 had round yellow seeds AB 



65 round yellow and green seeds ABb 



60 round yellow and wrinkled yellow seeds . . . . AaB 

 138 round yellow and green, wrinkled yellow and 



green seeds t AaBb 



From the wrinkled yellow seeds 96 resulting plants bore seed, of 



which: 



28 had only wrinkled yellow seeds aB 



68 wrinkled yellow and green seeds aBb. 



From 108 round green seeds 102 resulting plants fruited, of which: 



35 had only round green seeds Ab 



67 round and wrinkled green seeds Aab. 



The wrinkled green seeds yielded 30 plants which bore seeds all of 

 like character; they remained constant ab. 



The offspring of the hybrids appeared therefore under nine 

 different forms, some of them in very unequal numbers. When 

 these are collected and co-ordinated we find: 



38 plants with the sign AB 



35 " " " " Ab 



28 " " " " aB 



30 " " " " ab 



65 " " " " ABb 



68 " " " " aBb 



60 " " " " AaB 



67 " " " " Aab 



138 " " " " AaBb. 



The whole of the forms may be classed into three essentially 

 different groups. The first includes those with the signs AB, Ab, 

 aB, and ab: they possess only constant characters and do not vary 

 again in the next generation. Each of these forms is represented 

 on the average thirty-three times. The second group includes the 

 signs ABb, aBb, AaB, Aab: these are constant in one character and 

 hybrid in another, and vary in the next generation only as regards 

 the hybrid-character. Each of these appears on an average sixty- 

 five times. The form AaBb occurs 138 times: it is hybrid in both 



