Oct., 192 1 ] EMERSON ABERRANT CHROMOSOME BEHAVIOR 
The writer has not been able as yet to obtain from his own cultures 
aberrant seeds involving any of these linkages, but in Professor Hutchison's 
material a single aberrant seed involving C c and Sh sh has been observed. 
A colorless- and shrunken-seeded plant, c sh, pollinated by a plant hetero- 
zygous for these factors, C c Sh sh, produced the aberrant seed. It was 
I ^ K L 
« 
Fig. I. Aberrant endosperm in maize seeds. Factors involved: A and B, R r Su su; 
C and D, C c Su su; E, R r Wx wx; F, A a Wx wx; G, C c Sh sh; H, Su su: I to L, 
C c Wx wx. In I and J the upper figures show untreated seeds with purple-colorless aleu- 
rone, and the lower figures show the same seeds after the pericarp and aleurone layer have 
been removed, the corneous endosperm appearing dark and the waxy endosperm light. 
In K and L, the upper figures represent parts of untreated seeds and the lower figures 
corresponding cross sections of the same seeds. 
