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THE AMEBIC AX XA1TBALIST [Vol. XLYI 



within a certain wide range of variation, but a large 

 number of very striking types appeared, which, if they 

 come reasonably true in a third generation, must be 

 regarded as new forms of specific rank. These variants 

 constituted in some cases classes entirely distinct from 

 all of the other plants and in other cases were extreme 

 types of segregates connected by intermediate forms more 

 or less closely with the mass of the hybrids. Although the 

 two F l parent plants of these cultures, (10.30La and 

 10.30L&) were sisters, their progeny was far from similar. 

 Kach F, hybrid plant gave rise to its own peculiar set 

 of variants and the character of the plants constitut- 

 ing the mass of the cultures likewise differed greatly. 

 The present description of the cultures will be very brief, 

 but a more full and illustrated account may follow if 

 studies of the more interesting of the variants in a third 

 generation make the publication of such an account seem 

 desirable. 



1. The F 2 Generation (11.41) from the Hybrid Plant 

 10.30La 



This culture was grown from the contents of 26 cap- 

 sules containing in all about 3,300 seeds. From these 

 1,505 seedlings appeared in the pans within 5-7 weeks, 

 and 1,451 grew into well-developed rosettes. It was 

 possible to select from the rosettes a group of 141 

 winch were smaller than the average and had strongly 

 etiolated leaves; these rosettes developed a peculiar 

 group of dwarfed plants apparently constituting a clearly 

 defined class in the culture. The mass of the rosettes 

 presented a remarkable range, from many that resembled 

 very closely the rosettes of gni i/fliffont , distinguished by 

 having broader leaves cut at the base (see Davis, 11, 

 Fig. 6), to much smaller rosettes with narrow leaves 

 somewhat biriniis-llke in form. Between these extremes 

 was an assemblage of intermediates so various in char- 

 acter that I was unable to make any satisfactory classi- 

 fication further than the selection of the 141 etiolated 



