"I have experienced many a bitter hour in my life. Nevertheless, I admit gratefully that the beautiful, good hours far outnumbered the others."

"The numerical relations of the different forms in the successive generations are constant."

"I have seen the future of biology, and it is in the numbers."

"The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used, and thus in the case before us it cannot be immaterial what plants are subjec…"

"I have been patient, and patience is the key to discovery."