Schon die Versuche, welche in früheren Jahren an Zierpflanzen vorgenommen wurden, lieferten den Beweis, dass die Hybriden in der Regel nicht die genaue Mittelform zwischen den Stammarten darstellen.
Already the experiments that were performed on ornamental plants in previous years offered proof that hybrids do not, as a rule, present an exactly intermediate form between that of the parent-species.
ornamental plants = Zierpflanzen See p. 3, s. 2.
parent species = Stammarten Bateson has “parental species”, Sherwood has “parental strains”; see p. 5, s. 10.