I9I5] 



BART LET T—MA SS M UTA TION 



449 



mutations. As in the case of progenies from f. typica. mut. angusli- 

 folia, and mut. latijolia, the predominating form among the muta- 

 tions was mut. setacea. 



Fic. II. — ilut. albicans: 2 cauline plaats, Lexington E-5-106 (left! and 187 

 (right), from the F, progeny of f. lypka; no. 187 is shown also in fig. i. 



Mut. albicans. — This mutation reproduces itseh' in only a small 

 proportion of its progeny, but can be said to come true in the sense 



