1. Photothermographs, a tool for climate studies in relation to the ecology of vegetable varieties

   • J. H. A. Ferguson

   OriginalPaper Pages: 97 - 105

2. On the influence of extra R-genes on the resistance of the potato to the corresponding P-races¹) ofPhytophthora infestans

   • H. J. Toxopeus

   OriginalPaper Pages: 106 - 110

3. New aspects of breeding for disease resistance in beans (Phaseolus vulgaris L.)

   • N. Hubbeling

   ReviewPaper Pages: 111 - 141

4. Data from recent research in animal nutrition, important for breeders of fodder plants

   • J. W. Lackamp

   OriginalPaper Pages: 142 - 148

5. Wheat breeding in the Netherlands

   • H. De Haan

   OriginalPaper Pages: 149 - 160

6. Some effects of temperature on the shoot growth of cherry seedlings

   • L. Smeets

   OriginalPaper Pages: 161 - 168

7. Studies on the breeding of self-pollinating cereals

   • F. G. H. Lupton
   • R. N. H. Whitehouse

   OriginalPaper Pages: 169 - 184

8. On the inheritance of spraign resistance in potato varieties

   • J. Trip

   OriginalPaper Pages: 185 - 188

9. An additional report on the difference in phenotypic expressions between genes, R₁ and R₄, controlling resistance toPhytophthora infestans in potatoes

   • Noboru Takase

   OriginalPaper Pages: 189 - 192

10. The creation of tetraploid beets. V.

    • D. Kloen
    • G. J. Speckmann

    OriginalPaper Pages: 193 - 197

11. Review of books

    BookReview Pages: 198 - 198

12. Notes

    Announcement Pages: 200 - 200

13. Erratum

    Erratum Pages: 200 - 200