326 BOTANICAL GAZETTE [APRIL 
distinct white or pale yellow cap. The pure yellow seeds in most 
cases could easily be distinguished from these heterozygous yellow 
seeds by their darker color and absence of the light colored cap. 
Mixtures of “white” and “yellow” pollen, therefore, applied 
either to a white or a yellow seeded plant, produced two distinct 
classes of seeds which could easily be separated. Some yellow 
strains were found which, when crossed by white, did not give 
heterozygous seeds clearly distinguishable from pure yellow. No 
such crosses were used in 
comparing the weights of 
selfed and crossed seeds. 
The reciprocal cross of yellow 
on white always gave yellow 
seeds clearly distinct from 
pure white, as would be 
expected. 
~ In all the ears resulting 
from the application of mixed 
pollen, the selfed and crossed 
seeds were distributed at 
random (fig. 1). Approxi- 
mately equal quantities of 
pollen were used for each 
pollination, but, owing prob- 
with ably to the short viability 
pollinated with of maize pollen (1), the two 
showing distribution of  selfed and kinds were not always equal in 
crossed seeds. their ability to fertilize. The 
proportion of selfed and crossed 
seeds, therefore, varied greatly. In some cases all the seeds were 
crossed, in others all selfed. 
Twenty-four ears having both selfed and crossed seeds were 
obtained, and all gave an increase in average weight of the crossed 
seeds over the average weight of the selfed seeds, ranging from 
5 to 35 per cent. The complete data will be published elsewhere, 
as these results were obtained in connection with a different 
investigation. A typical distribution of the weights of the selfed 
