264 BOTANICAL GAZETTE 



The size of these cultures is given in table V. 



TABLE V 



[OCTOBER 



Year 



Generation 



Mutants 



1911 

 1913 

 1913 



(( 

 It 



1914 



Ci 

 tt 



191S 



Second 

 Second 

 Third 



Fourth 



tl 



Fifth 



I rubrinervis 

 I liquida 



I nanella, i 



cana 

 I scintillans, 



I lata, I al- 



bida 



I nanella 



The offspring of the 4 specimens of Lamarckiana had this 

 uniform type, in the flowering specimens as well as in the other 

 ones. These were examined in June and July when in large rosettes 

 of radical leaves. The offspring of the mutant rubrinervis was also 

 uniform and exactly resembled the race of this name in all its 

 marks, and especially in the brittleness of its stems. The offspring 

 of the original mutant, cultivated in 1911, embraced 129 plants, 

 only 6 of which have flowered, the others having been destroyed 

 before the significance of the culture had been realized. Among 

 these 6, 2 were Lamarckiana, 3 pallescens, and i mut. rubrinervis. 

 Their offspring were studied in 1913, as given in table V. Among 

 the mutants the rubrinervis, liquida, scintillans, lata, and cana, as 

 well as one nanella, flowered and proved their identity with the 

 races of these names at that period. 



Pedigree of mut. pallescens no. 2 

 191 1 . . Mutant Mutant 



1913.. Second generation 28 per cent pallescens Lamarckiana i mut. rubrinervis 



1914. .Third generation 42 per cent pallescens Lamarckiana LamarcHana 



