1. Use of variation or replications in breeding work

   • J. C. Dorst

   OriginalPaper Pages: 111 - 118

2. The breeding of hybrid varieties and the production of hybrid seed in spinach

   • J. Sneep

   OriginalPaper Pages: 119 - 122

3. Some notes on the relations between field resistance to Phytophthora infestans in leaves and tubers and ripening time in Solanum tuberosum subsp. Tuberosum

   • H. J. Toxopeus

   OriginalPaper Pages: 123 - 130

4. Some observations on the floral biology of the carrot (Daucus carota L.)

   • J. P. Braak
   • Y. O. Kho

   OriginalPaper Pages: 131 - 139

5. Empirical estimation of thermoreaction curves for the rate of development

   • J. H. A. Ferguson

   OriginalPaper Pages: 140 - 146

6. Studies on the breeding of self-pollinating cereals

   • R. N. H. Whitehouse
   • J. B. Thompson
   • M. A. M. Do Valle Ribeiro

   OriginalPaper Pages: 147 - 169

7. Vegetative maintenance and propagation of cauliflower

   • M. Nieuwhof

   OriginalPaper Pages: 170 - 178

8. On bacterial wilt of alfalfa (Medicago sativa L.) caused by Corynebacterium insidiosum (McCull.) Jensen, in Italy

   • M. Ribaldi
   • A. Panella

   OriginalPaper Pages: 179 - 182

9. The Trojan square

   • L. A. Darby
   • N. Gilbert

   OriginalPaper Pages: 183 - 188

10. Breeding wheat and barley for winterhardiness

    • G. Dantuma

    OriginalPaper Pages: 189 - 195

11. Reviews of books

    BookReview Pages: 196 - 196

12. Old and new books dealing with general plant breeding

    • H. De Haan

    OriginalPaper Pages: 197 - 221

13. Notes

    Announcement Pages: 222 - 222