No. 547] GENETIC AL STUDIES ON (EN OTHER A 415 



the l\ hybrid plant (10.30L&) from which they came. 

 The red-stemmed plants were most numerous towards the 

 more grandi flora-like end of the culture and the green- 

 stemmed towards the more biennis-Mke end. 



A larger number of remarkable new types appeared in 

 this culture than in the former (11.41), types specifically 

 different from either biennis or grandiflora, or the F t 

 hybrid plant 10.30L&. The list is as follows: 



11.42e, a type represented by 4 plants with small and 

 narrow leaves, and medium-sized flowers. 



11.42/, leaves small, irregularly toothed, flowers 

 medium-sized, capsules large (about 3.3 cm. long) ; repre- 

 sented by several plants and intergrading with the mass 

 of the culture. 



11.42#, medium-sized plant with large flowers and large 

 crinkled leaves ; a type rather common and intergrading 

 with the mass of the culture. 



11.42;, a single plant with almost linear leaves, flowers 

 very small (petals 6 mm. long), anthers sterile. In its 

 foliage this plant seems very close to De Vries's 

 "mutant" (Enothera elliptica, 



1 1.42/, medium-sized flowers; remarkable for its broad, 

 entire, and very much crinkled leaves. 



11.42r, the class separated as 147 small rosettes with 

 narrow leaves of which 90 were saved and grown to 

 maturity. The mature plants, 3-4 dm. high, rarely 

 branched, bore medium-sized flowers, and constituted a 

 clearly defined class of dwarfs. 



There are not included in the above list the numerous 

 segregates with characters in various combinations ap- 

 proaching one or the other of the parents of the cross. 

 Some of these types clearly differed specifically from the 

 F, hybrid plant 10.30L&. 



A consideration of these two cultures (11.41 and 11.42) 

 of hybrids in the second generation will bring out certain 

 important conclusions that may be summarized. 



1. In the immensely greater diversity exhibited by the 

 F 2 generation over that of the F t is clearly shown a 



