i9iS] 



BARTLETT—MASS MUTATION 



437 



but no progenies have yet been grown or chromosome counts made, 

 except in the case of one plant, belonging to the mass mutant strain. 



/O cm 



Fig. 5. — Progeny of Lexington E-5, pan 11 (part of culture 5; see table II); 

 the pan contains 49 plants, which were classified (most of them at maturity) as follows; 



