106 = Self-Incompatibility in Hermaphrodite Plants 
duction has been somewhat irregular but there has been no case of 
decided increase in self-fertility as the plant progressed in bloom. Cases . 
showing the opposite condition have been found, but this was not known 
in time to make tests to determine if all seed production was not also 
decreased. 
Efforts have been made to test for end-season fertility, especially 
in a line of red-leaved Treviso which has a somewhat shortened period 
of bloom. -In 1918, 10 plants, the first to flower in each of two series, 
were thus studied. The plants that were completely self-incompatible 
during the first ten days of bloom, in tests of about 30 flower heads, 
remained completely self-sterile throughout. The only decided variation 
in fertility observed in self-fertile plants was in the direction of a decrease. 
Data may be given in detail for 4 plants which illustrate the results 
obtained. 
Plant R 12-11-59, no. 53. A plant feebly self-compatible from the 
first day of blooming and judged to be 4°/, self-compatible. Bloomed 
from July 11 to Aug. 21. The dates of pollinations and number of seed 
per head were :—July 12th, 0, 0, 0, 2, 4,7; 16th, 0, 0, 0, 0, 0, 0, 0, 9, 9 
0, 0, 0, 0, 7,8; 22nd, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2; 25th, 0, 0, 0, 0, 9; 29th, 
0, 0,0,0,1; Aug. 2nd, 0, 0,0; 15th, 0,0, 0,0, 2, 2. From Aug. 5th 
until the 21st few and scattered flower heads were produced and the 
branches were dying and becoming dry and brittle. The heads tagged 
for selfings were well distributed over the plant. 
Plant R 12-11-59, no. 2. Bloomed from July 1 until Aug. 20. 
Record as follows :—July 2nd, 0, 5,11; 5th, 0,3, 6; Sth, 0,0, 0,0, 0, 1, 3,85 
12th, 0, 0,0, 0, 0, 2, 4,9; 16th, 0,0, 0,0, 0, 0,0, 0,0; Aug. 8th, 0, 0, 0, 9, 9; 
12th, 0,0, 0, 0,1. These results seem to indicate that the plant was 
feebly self-compatible at first but less so later. 
Plant R 12-11-59, no. 6. Bloomed from July 12 until Aug. 28. 
A completely self-incom patible plant. Dates and number of heads 
given :—July 12th, 2; 15th, 15; 18th, 5; 22nd, 12; 25th, 6; 29th, 5; 
Aug. 2nd, 6; 5th, 5; 7th, 10; 8th, 7; 9th, 4; 17th, 2; 19th, 1. All heads 
failed completely as shown in fig. 1 of Plate III. There were no 
partially formed seeds. , 
Plant R 12-11-49, no. 79. A plant completely self-incompatible. 
All the pollinations here recorded were made by hand. Plant bloomed 
from June 21 until Aug. 13. Dates and number of heads selfed are a8 
follows :—June 21st, 2; 24th, 1; 26th, 5; 28th, 8; July 2nd, 10; Sth, >: 
pote 21st, 5; 23rd, 4; 26th, 3; Aug. 4th, 8; 6th, 3; Sth, 1; 9th, 1; 
