"The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used."

"I measure, I count, I compare—this is the way of science."

"The constant differential characters of the two parent forms are transmitted to the hybrids unchanged."

"My scientific work brought me such satisfaction, and I am convinced the entire World will recognize the results of these studies."

"It requires indeed some courage to undertake a labor of such far-reaching extent; this appears, however, to be the only right way by which we can finally reach the solution of a question the importanc…"