1. The colourfactors of the seedcoat in phaseolus vulgaris L. and in Ph. multiflorus Willd

   • M. J. Sirks

   OriginalPaper Pages: 97 - 138

2. A preliminary statement of the results of Mr. Houwink's experiments concerning the origin of some domestic animals

   • J. P. Lotsy
   • K. Kuiper

   OriginalPaper Pages: 139 - 172

3. Boekbespreking

   • Sirks
   • J. P. Bannier
   • Lotsy

   BookReview Pages: 173 - 192