250 
GENETICS: D. F. JONES 
mine the accuracy of the classification. In the meantime it hardly seems pos- 
sible that the error could be so great as to hide an actual selective fertiliza- 
tion in favor of cross-pollination, since the inbred strains are so uniform in 
color of endosperm and the crossed seeds usually so distinct that the error 
of classification is small and presumably not all in one direction. And if there 
is no selection in favor of cross-fertilization, there is then no effect of crossing 
until the zygote is formed however great the advantages immediately accruing 
to the resulting embryos and endosperms. 
1 An extract from a treatise submitted to the faculty of the Bussey Institution of Har- 
vard University in partial fulfillment of the requirements for the degree of Doctor of Sci- 
ence, December, 1917, and to be published in full as a contribution from the Connecticut 
Agricultural Experiment Station. 
2 East, E. M., Connecticut Agric. Exp. Sta. Rep., 1907, 1908, (419-428); Amer. Nat., Lan- 
caster, Pa., 43, 1909, (173-181). 
5 East, E. M., and Hayes, H. K., Washington, U. S. Dept. Agric, Bur. Plant Ind. BulL 
No. 243, 1912. 
