(347) 
In general, my studies of fertility during the past year 
may be grouped according to the type of sterility and the 
problems chiefly involved as follows: (1) the relation of 
vegetative vigor to reproductive vigor, (2) intersexualism, 
or inherent variations in the relative development of 
stamens and pistils, and (3) physiological incompatibility. 
It may be reported that the investigations of the past 
two years indicate that sterility in certain species of Lilium 
and Hemerocallis which are propagated exclusively by 
vegetative means is due to incompatibilities in fertiliza- 
tion rather than to direct correlation with vegetative 
reproduction. To fully prove this point, at least for certain 
species, wild plants from the native home of the species 
are desired for study and efforts to secure these are being 
made. 
Cultures of Lythrum Salicaria have yielded interesting 
results both as to sterility from compatibility and sterility 
from intersexualism, a report of which is in preparation. 
In all of the studies mentioned above, the question of 
heredity has been very fully considered. Cytological 
studies of phenomena of fertilization in these plants are 
being made chiefly by the technical assistant, Miss Rusk. 
During the period of the war, only a few plants of the 
principal varieties of Coleus, obtained as bud sports, were 
kept living. Studies with these have been resumed and the 
hereditary value of the segregations giving bud sports is 
now being tested by seedling progeny. 
The various lines of research noted above are planned so 
that the attention required is well distributed over the 
entire year. The Brassicas are grown as winter and early 
spring crops; the grapes demand especial attention in 
spring and late autumn; the Lythrums and the Irish potatoes 
are summer crops, etc. This distribution facilitates the 
work and promotes economy in labor and in the full use of 
greenhouses and breeding plots. 
