[29 & 30]

Red Cabbage Apogeotropism of Hypocotyl

Sept. 11th. 1878

Apogeotropism of Hypocotyl of Cabbage

upper. Horizontal glass Cabbage

[30]

109

Ipomoea

generations to chiefly to all crossing having been absolutely prevented during the previous six generations.

A plant appeared in the sixth self-fertilised generation, named the Hero, which exceeded by a little in height its crossed antagonist, and which transmitted its powers of growth and increased self-fertility to its children and grandchildren. Intercrossing A cross between the children of Hero did not give to the grandchildren thus produced any advantage over the self-fertilised grandchildren produced raised from the self-fertilised children. And as far as many my observations can be trusted, which were made on very unhealthy plants, the great-grandchildren raised from intercrossing the grandchildren again had no advantage over the seedlings from the self-fertilised grandchildren the product of continued self-fertilisation; and what is far more remarkable, the great-grandchildren raised by crossing the grandchildren with a fresh stock, had no advantage over either the intercrossed or self-fertilised