With regard to this question of the transformation of one species into another, Mendel himself, in the concluding paragraphs of his article on hybridization, seems to agree with the expressions of Morgan.
"Catholic Churchmen in Science"
James J. Walsh
Intracellular Pangenesis By Hugo De Vries Including a paper on fertilization and hybridization.
"A Mechanico-Physiological Theory of Organic Evolution"
Carl Von Nägeli
Because of these points of superiority in the Old World grape, since Valk, Allen and Rogers showed the way, American grape-breeders have sought to unite by hybridization the good characters of the Old World grape with those of the American.
"Manual of American Grape-Growing"
U. P. Hedrick