1. Species hybrids in Delphinium

   • R. A. H. Legro

   ReviewPaper Pages: 1 - 23

2. On some aspects of reciprocal recurrent selection

   • F. W. Schnell

   OriginalPaper Pages: 24 - 30

3. A cheap method of testing spinach plants for blue mould resistance during the summer months

   • C. M. Rodenburg

   OriginalPaper Pages: 31 - 34

4. The effect of R-genes for hypersensitivity in potato-leaves on tuber resistance to Phytophthora infestans

   • L. Roer
   • H. J. Toxopeus

   OriginalPaper Pages: 35 - 42

5. Crosses between early and late heading timothy plants

   • G. E. Van Dijk

   OriginalPaper Pages: 43 - 48

6. Breeding Scorzonera hispanica L. by the polycross method

   • O. Banga

   ReviewPaper Pages: 49 - 58

7. Problems in breeding and cytology of sugar cane

   • G. Bremer

   OriginalPaper Pages: 59 - 78

8. The analysis of variation in cultivated plants with special reference to introgression

   • Edgar Anderson

   OriginalPaper Pages: 79 - 86

9. Introgression facilitated by apomixis in polyploid Poas

   • Jens Clausen

   OriginalPaper Pages: 87 - 94

10. The production of hexaploid Solanum x juzepczukii

    • H. W. Howard

    OriginalPaper Pages: 95 - 100

11. Selection of rye by means of leaf counting

    • R. F. Hoogland

    OriginalPaper Pages: 101 - 108

12. The work of FAO in the field of crop improvement

    OriginalPaper Pages: 109 - 112

13. Interspecific hybridization between Corchorus sidoides F. Muell. and C. siliquosus L., a natural polyploid

    • R. M. Datta
    • S. K. Sen

    OriginalPaper Pages: 113 - 119

14. Notes

    Announcement Pages: 119 - 120