"The constant characters are those which are transmitted unchanged from the parental plants to the offspring."

"The most important result of hybridization is beyond doubt the production of new constant forms."

"It requires indeed some courage to undertake a labor of such far-reaching extent."

"That no generally applicable law of the formulation and development of hybrids has yet been successfully formulated can hardly astonish anyone who is acquainted with the extent of the task and who can…"

"My experiments with single traits all lead to the same result: that from the seeds of hybrids, plants are obtained half of which in turn carry the hybrid trait (Aa), the other half, however, receive t…"