SEED COAT COLOR IN GARDEN BEANS. 



101 



The Genetic Constitution of the Varieties used. 



In the following table is given the genetic constitution as indicated by 

 the investigations here reported. It is not asserted that these are correct 

 in ail cases, even should the general hypotheses here presented prove 

 sound. Moreover, there are doubtless in a given variety different strains 

 of indistinguishable external appearances, especially among the non- 

 pigmented varieties. 



Blue Pod Butter, 



Bountiful, . 

 Burpee Stringless, 

 Challenge Black Wax, 



Creaseback, 



Currie, 



Davis Wax, 



German Black Wax, 



Giant Stringless, . 



Golden Carmine, . 



Golden Eyed Wax, 



Keeney Rustless, . 



Longfellow, 



Low Champion, . 



Mohawk, 



Prolific Black Wax. 



Red Valentine, 



Ward well, 



Warren, 



Warwick, 



White Marrow, 



PTYzmm'oGfcHEd 



PTYzmm'oGFcHEd 



PTYzmm'ogFcHED 



PtYZmM'OgFCHED 



PTyZMm'OgFChEd 



PTyZMm'OGFChED 



pTYZMm'OXG 



pTyZMm'oXGFCHED 



PTyZMm'OGFcH 



PTyZMm'OGfCHED 



PTyZMm'OGfCHeD 



pTYZmM'oged 



PTyZMm'OGFCHED 



PTyZMm'OgfChEd 



PTYZmM'ogfchEd 



PtyZMm'OgfChed 



PtYZmM'OGfcHED 



PTYZmM'OgfcheD 



PTyZmM'OeD 



PTYZmM'OgFcHED 



PTyZMm'OGFcHE 



PTYZmM'OgfcheD 



PTYZmM'OgfcHeD 



PTYZmM'OgfCheD 



PtYZmM'OgFcHED 



PTYzmM'ED 



PTYZmM'OgfcHeD 



pTYZMM'ogfCheD 



pTyZMM'ogfChedpTYz 



pTyZMM'ogfCheD 



The significance of the letters is as follows : — 



P is the factor for pigmentation, without which the bean is white. Pre- 

 sumably this factor is the one causing the production of the basic chro- 

 mogen. 



T is the factor for totality of pigmentation, without which the bean is 

 an eyed bean if P is present. 



Y and Z are the factors for mottling, which are coupled in mottled vari- 

 eties but may exist separately in non-mottled varieties, and if brought 

 together in crossing give mottled beans which break up in later generations. 



M and M' are the two modifiers, M giving rise to the beans of the yeUow- 

 black series and M' to those of the red series. They doubtless represent 



