"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…"

"I have been called a dreamer, but the numbers do not dream."

"The value of the experiment as a means of solving questions of evolution must not be underestimated."

"This circumstance is especially important for the evolutionary history of plants because constant hybrids acquire the status of new species."

"To live without experiencing some shame and blushes of admiration would surely be a wretched life."