"You should regard the numerical expressions as being only empirical, because they can not be proved rational."

"The inheritance of traits is not a matter of chance but of law."

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

"The traits of parents do not blend in their offspring but remain distinct."

"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…"