2S6 BOTANICAL GAZETTE [October 



That of mutant no. 3 was as follows: 

 1908 Mutant Mutant 



1913 Second generation 60 per cent cana ~ Lamarckiana 



1914 Third generation 46 per cent canaT" Lamarckiana Lamarckiana 



It is easily seen that they agree almost exactly with the pedigree 

 of mutant no. i, and simply give further proofs of the conclusions 

 drawn from this. The size of the two cultures is given in table II. 



TABLE Jl 



In each case the self-fertilized seeds of only one cana were 

 studied, besides those of the mutants, and also those of only one 

 atavist of the Lamarckiana type. The progeny of the latter 

 proved to be uniform and like the parent, about one-half of the 

 plants being studied in the flowering condition and the remainder 

 in the stage of large rosettes of radical leaves in July. The lata 

 mutant has flowered, as have the majority of the dwarfs. Two 

 mutants of a new type arose, which will have to be described in 

 another paper. They resembled 0. rubrinervis, but lacked the 

 characteristic brittleness of the stems of this form. 



The second generation of mutant no. 3 has been the most 

 vigorous one of all my annual cultures of 0. cana. It was grown, 

 moreover, under exceptionally favorable conditions. For this 

 reason it has been chosen for making a series of crosses, which will 

 be dealt with at the end of this article. The fact that, in this case, 



