Page:Popular Science Monthly Volume 78.djvu/545

Rh complex phases and devoted ourselves temporarily to the morphological and physiological problems upon which they rest.

While testing out this idea in studies of the relationship between structural characteristics and fertility in various fruits, certain inconsistencies in results were found which could be most easily explained by the assumption that there is a selective elimination in which ovaries

 Staphylea. Differences expressed In percentages of the mean of the eliminated series. Solid dots and broken lines = mean number of ovules; circles and firm lines = radial asymmetry.

of certain types are extensively weeded out Direct investigation proved the correctness of this assumption. The results will be set forth very briefly.

In the selective elimination which occurs during the development of the ovary of the American bladder nut, Staphylea, into a fruit, the