1. The origin of new forms in Rubus, I

   • M. B. Crane
   • C. D. Darlington

   OriginalPaper Pages: 241 - 278

2. Natural crossing and the genetics of axil spot in cacao

   • S. C. Harland
   • G. E. Frechville

   OriginalPaper Pages: 279 - 288

3. What do we know of the descent of man?

   • J. P. Lotsy

   OriginalPaper Pages: 289 - 328

4. Methods for calculating the actual gametic F₂ series from a given zygotic series

   • S. J. Wellensiek

   OriginalPaper Pages: 329 - 340

5. Erblichkeitsuntersuchungen an Nigella Damascena L

   • H. J. Toxopéus

   OriginalPaper Pages: 341 - 442

6. Linkage-studies in Pisum. I

   • S. J. Wellensiek

   OriginalPaper Pages: 443 - 466

7. The inheritance of melanism in hybrids between continental Tephrosia crepuscularia and british T. Bistortata, with some remarks on the origin of parthenogenesis in interspecific crosses

   • J. W. Heslop Harrison

   OriginalPaper Pages: 467 - 480

8. Length-factors in Pisum

   • H. de Haan

   OriginalPaper Pages: 481 - 498

9. Illustrations of wild hybrids in the New Zealand Flora V

   • H. H. Allan

   OriginalPaper Pages: 499 - 515

10. A preliminary note on the origin of the „Jaffa orange”

    • J D. Oppenheim

    OriginalPaper Pages: 516 - 520

11. Boekbespreking

    • P. J. Waardenburg
    • H. N. Kooiman
    • M. A. van Herwerden

    BookReview Pages: 521 - 531