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THE AMERICAN NATURALIST [Vol. XL V 



sembled Lamarck tana more closely than those of the other 

 cultures in the F 2 generation, differing chiefly in the 

 smaller size of the basal leaves and in the absence of red 

 tinted papillate glands on a green stem, the stem being 

 mottled with red. One plant of this culture (10.12 Lz) 

 was selected for marked peculiarities, but will not be de- 

 scribed unless its behavior in an F 3 generation proves of 

 sufficient interest. 



About 800 seedlings of hybrid 9bc appeared in the cul- 

 ture, from which 95 plants were selected as representa- 

 tive types of rosettes. A few dwarf rosettes were pres- 

 ent, six of which set in the ground developed into un- 

 branched plants about 1 dm. high, that failed to flower. 

 The culture in general exhibited considerable variation, 

 the most interesting types of plants being several with 

 light green, smooth, obtusely pointed leaves, similar in 

 shape to Lainarckiaua, but without crinkles. There was 

 shown the same previously described tendency on the 

 part of a few rosettes and mature plants to depart from 

 the average of the culture towards the characteristics 

 of the respective parents of the cross, maintaining, how- 

 ever, a blended structure of their parts. 



Considering these cultures of F 2 generations in com- 

 parison with the F, generations that have heen grown, 

 the most striking feature is the greater range of varia- 

 tion exhibited not only by the F 2 plants as a whole, but by 

 their different parts. Since the studies were not quanti- 

 tative in character, because such a large proportion of the 

 seedlings were necessarily discarded, it has not seemed 

 best to describe the variations in detail and such an in- 

 vestigation is deferred for the present. However, in this 

 increased variation is clearly indicated at least a relative 



