IQlfi] 



1911. .Mutant 



DeVRIES— DIMORPHIC MUTANTS 



Pedigree or mut. pallescens no. 3 

 Mutant 



26s 



1913.. .Second generation 36 per cent pallescens Lamarckiana i mut. cana 



1914. .Third generation 39 per cent pallescens Lamarckiana Lamarckiana 



The size of these cultures is given in table VI. 



TABLE VI 



Among the mutants the rubrinervis, both cana, one lata, and 

 some nanella have flowered. The individuals of pallescens and 

 Lamarckiana, which did not flower, were examined in June 

 and July as large rosettes. Most of the flowering specimens were 

 observed during the months of August and September. 



The percentage figures of these tables vary from 23 to 43, the 

 means for the 3 families being 33, 35, and 37 per cent, and the total 

 mean being 35 per cent. On account of the evident weakness of 

 the individuals of the pallescens t3^e, as compared with their 

 Lamarckiana-'^k.& sisters, these figures may be assumed to show 

 that the splitting into two main types took place in about equal 

 parts. The spHtting is constantly repeated from the pallescens 

 specimens, but the progeny of the Lamarckiana type retain this 

 type uniformly. 



I have made only one cross in these famiHes, and that in order 

 to ascertain the properties of the pollen of the pallescens indi- 

 viduals. I placed this pollen on the stigma of some flowers of 



