I wish to speak about one effect of hybridization, which is really connected with heredity factors, the vigor which occurs when we cross different varieties, species, or even races. In my experience certain types that have been naturally contrasted finally lose vigor, and after two or three generations the plant disappears. Then again I could show you cases where yields are greatly increased due to hybridity. These are established facts, not only as regards species of plants and trees but also as regards the human race. Hemy, in Dublin, who has done the best work in this line of endeavor, believes that many of our more rapid-growing trees are rapid-growing because they are hybrids. To summarize, I have tried to point out the fact that diversity which we see in nature is real, and that it is brought about by two causes, namely, environment, and heredity. And that heredity is brought about by factors in the bodies of the chromosomes which are shuffled around like cards in a pack; they reappear in the same way that the cards will reappear. We have no means, as yet, of controlling the appearance of the factors, but we have two methods of getting new factors, as follows: One--The finding of new things in nature; that, probably, is the very best method that can be used. The work of the theoretically planned project points out the tremendous importance of the exceptional individual. Two--By taking the exceptional individuals, and by crossing them, you can recombine, although the results may be very complex, and obtain characters that are very desirable. As ministers sometimes say to clinch the moral, I would say, "Seek earnestly that which is best and hold fast to that which is good." THE PRESIDENT: Has anyone a question he would like to ask? DR. MORRIS: In attempting to make crosses between juglans and carya we find often that the pollen of carya will excite the cell of the juglans but without making a fusion. What is the element of the male cell of the hickory which starts the female cell of the walnut into action? THE SECRETARY: I would like to ask Dr. Blakeslee one thing; he showed the influence of the black walnut on the growth of the hedge, and he showed that something other than the effect from the black walnut had caused these plants to be dwarfed. Is that understood to be a fact? DR. BLAKESLEE: No; some of the effect was due to the black walnut. MR. HICKS: In some cases the trees get sick and die. I have observed many plants and trees growing close to walnuts and I can point out peach trees and other fruits planted close to black walnut trees which have been injured. I should like to see the question determined. MR. O'CONNOR: On Mr. Littlepage's place it seems that some blackberries thrive better in the shade of the walnut tree than anywhere else.