1. The symbolizing of hereditary factors

   • H. de Haan

   OriginalPaper Pages: 1 - 22

2. Canna crosses

   • J. A. Honing

   OriginalPaper Pages: 23 - 47

3. On the relation between geographic races and polyploidy in silene ciliata pourr

   • Kathleen B. Blackburn

   OriginalPaper Pages: 49 - 66

4. Zwillinge mit epilepsie

   • J. Sanders

   OriginalPaper Pages: 67 - 88

5. The inheritance of self-sterility in Petunia Violacea

   • S. C. Harland
   • O. S. Atteck

   OriginalPaper Pages: 89 - 102

6. A contribution to the sterility and irregularities in the meiotic processes caused by virus diseases

   • Dontcho Kostoff

   OriginalPaper Pages: 103 - 114

7. On the occurrence of triploid intersexes in hybrids of the lepidopterous genus Oporinia

   • J. W. Heslop Harrison

   OriginalPaper Pages: 115 - 124

8. Zum Problem “Alkohol und Nachkommenschaft”

   • G.P Frets

   Boekbespreking Pages: 125 - 128