I22 
shriveled and not viable. 
self-compatible. 
Fic. 7.—Plant of B. chinensis; no flower 
abortion; plant highly self-compatible; 
showing cycle of self-compatibility with 
climax at time of mid-bloom. 
fruiting period, as shown in figs. 6 and 7. 
BOTANICAL GAZETTE 
[FEBRUARY 
Such plants were classed as feebly 
Plants whose self-compatibility was classed as 
medium produced some viable 
seeds. The number of pods, the 
number of shriveled seeds, and 
to some extent the number of 
viable seeds varied greatly 
among plants thus grouped. 
The plants classed as strongly 
self-compatible produced nu- 
merous pods, and. the total 
number of viable seeds was 
high. In these also the num- 
ber of pods, their size, and the 
numbers of viable and of shriv- 
eled seeds varied greatly. The 
various grades of self-compati- 
bility were seen among sister 
plants that were as nearly iden- 
tical as is possible in regard to 
vegetative vigor, number of 
branches and flowers produced, 
and as to calendar dates for 
period of blooming. 
It was readily recognized 
that the self-compatibility of 
such plants was most strong 
during the period of mid-bloom, 
and that previous to and fol- 
lowing this period there was 
complete _ self-incompatibility. 
A highly self-compatible plant 
grown in isolation and carefully 
self-pollinated from day to day 
appeared at the end of the 
Repeated tests by 
crossings showed that in these, as in the case of the self-incompatible 
