Versuche über Fütterung mit lipoidfreier Nahrung.

Stepp discovered that removal of fat from the diet greatly reduced its nutritive value, but that substitution of pure fats did not replace the deficiency. He thus discovered the existence of fat-soluble vitamins, without fully realizing what he had discovered. For his later papers, see the Zeitschrift für Biologie, 1911, 57, 135; 1913, 62, 405.