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• Species and varieties, their origin by mutation lectures delivered at the University of California by Hugo De Vries Edited by Daniel Trembly MacDougal.
  Auteur(s): Vries, Hugo de ,  MacDougal, Daniel Trembly
• Species and varieties, their origin by mutation lectures delivered at the University of California
  Auteur(s): Vries, Hugo de ,  MacDougal, Daniel Trembly
• Species and varieties their origin by mutation.
  Auteur(s): Vries, Hugo de ,  MacDougal, Daniel Trembly

• The water-relation between plant and soil
  Auteur(s): Livingston, Burton Edward ,  Hawkins, Lon Adrian
• The venom of Heloderma
  Auteur(s): Loeb, Leo
• Studies on the germ cells of aphids.
  Auteur(s): Stevens, Nettie Maria