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THE AMERICAN NATURALIST [Vol. XLVIII 



velop. At this time the entire plant was caged. Subse- 

 quently the seeds of the open fertilized and of the guarded 

 flowers were sown separately, with the following results : 



The figures are given separately to again call attention 

 to the fact that open fertilization is no hindrance to pedi- 

 gree work in Capsella. Since the seeds came from the 

 same parent, we may add the results, which gives us 

 arachnoidea 23.50 per cent., ''narrow" 40 per cent, and 

 rhomboidea 36.50 per cent. The fact that the percentage 

 for "narrow" is too low and that for rhomboidea too 

 high, while the percentage for arachnoidea is within the 

 limits of probable error, is probably due to errors in 

 classification, since greater weight was laid upon lobing 

 of the adult leaves than upon comparative width of the 

 earlier ones. The value of this culture lay chiefly in its 

 suggestion of a zygotic combination BBNn, which prior 

 to that time, on account of the gametic repulsion theory, 

 was not supposed to exist. In consequence, a number of 

 cultures were made, with the following result : 



90.50 ; 42 45.25 ! 30, 



\V2ARi\r:i BBS 



412BJJ2P6 BBS 



U2BRQP5 BBS 



4V2BR9P2 BBS 



