1922| SINNOTT—FRUIT SHAPE 103 
3. In two of these crosses, the extracted spheres are distinctly 
flatter than the pure types, and the extracted discs distinctly deeper 
than the pure discs. This can be explained by assuming the opera- 
tion, in each case, of a second flattening factor, also dominant, but 
showing a much smaller effect than the first. 
4. Evidence is brought forward that shape-determining factors 
actually exist, and that the facts here set forth are not due merely 
to the segregation of size factors. 
CONNECTICUT AGRICULTURAL COLLEGE 
STORRS, CONN 
