118 Self-Incompatibility in Hermaphrodite Plants 
For the J, of this line the progeny of one plant, R 9-34 No. 46, were 
grown. This plant was the most highly self-compatible, and was one of 
the best’ developed plants of its series. The flower heads opened 
normally and the anthers dehisced properly. Of the 240 seed sown only 
160 germinated. Many seedlings were poorly developed; 32 died 
within four weeks after germination; 18 others died before the crop was 
planted in the field. 
Of the 111 plants grown in the field only three were over 44 feet 
tall; 60 were from 8 inches to 3 feet in height when fully mature. 
Flower heads developed and opened poorly on nearly all plants. 
At least 50 set no seed at all, and only 6 plants produced seed in 
considerable numbers. Giant pollen grains were found for 13 out of 30 
plants whose pollen was examined. All plants were fasciated im some 
degree, and in the majority the duplication was strong with much 
torsion, but lesions were not frequent. 
The series of the I, was characterized by extreme degeneracy in 
vegetative growth and sexual potentiality. This condition was more 
marked in the J, than in the J,, both as to the degree to which individual 
plants were degenerate and as to the proportion of such plants. _ 
2. Families of marked vegetative vigour. No case of degeneracy 
either in vegetative growth or in potency for seed production developed 
in the other two lines of descent of the J,. The parents were well 
developed plants having slight or medium degrees of fasciation. One 
parent R 10 No. 8, shown in plate of a former paper (Stout 1917, Fig. 1), 
was one of the tallest and most vigorous plants grown to that date. 
The other parent (R 12 No. 17) was a smaller plant and bloomed for 
a shorter period, 
All plants of both series were highly productive of seed to open 
pollination. Some irregular or giant pollen grains were found, but these 
were present for self-compatible and self-incompatible plants without 
discrimination. The series /0-8— was taller in growth, and began 
bloom later but bloomed for a longer period than did series 12?-/- 
Each series was rather uniform in itself and the differences between 
them were identical with those exhibited by their respective parents. 
For the I, generation three series in each family were grown. In 
all, there were 471 plants whose self-compatibility was determined and 
25 others whose fertility was not studied. Every plant produced flowers 
which appeared to be fully normal, all were highly productive of seed to 
open pollination, and all were of vigorous growth. 
The differences in vegetative growth of these two families seen in 
