A single kind of red cell is supposed to have an enormous number of different substances on it, and in the same way there are substances in the serum to react with many different animal cells. In addition, the substances… — Karl Landsteiner Copy Share Image
Many different substances, as distinct to the practiced eye as stone and wood, go to the making of a novel, and it is necessary to see them for what they are. — Percy Lubbock Copy Share Image
