94 



MASS. EXPERIMENT STATION BULLETIN 185. 



numbers involved were larger they would appear in many crosses where 

 they are not shown. 



According to the hypotheses already advanced, these crosses involve 

 varieties whose constitution may be expressed by PYZmM' X PyZMm', 

 each variety possessing one or more determiners in addition. The mottled 

 beans of the yellow-black series, appearing from these crosses, are the 

 heterozygotes lacking the determiners E and D. No such beans have 

 bred true. 



Table XX. — Crosses of Varieties of the Yellow-black with the Red Series. 



A detailed study of the records of the progeny of crosses like those 

 shown in Table XX., giving consideration to the manifestation of the 

 various pigments, leads to conclusions already advanced in the discussion 

 of the crosses belonging within each series (page 84). Some five or six 

 varieties of red mottled beans have been crossed with a similar number 

 belonging to the yellow-black series. The results do not lend themselves 

 readily to tabular presentation, therefore they are dealt with in a text 

 discussion. These facts are in addition to those shown in Table XX. 



Red Valentine crossed with Golden Eyed Wax yields buff beans in 



