 | PREFACE (Dr. G. de Bakker, ir. W. van Soest) |
| SPONTANEOUS MUTATION AS A SOURCE OF CLONAL VARIATION ON DECIDUOUS FRUITS (J. Doorenbos) |
| ARTIFICIALLY INDUCED GENETIC VARIATION IN FRUIT TREES (C. Broertjes) |
| RESEARCHES CONCERNING THE CLONAL VARIABILITY AT THE STARKSPUR GOLDEN DELICIOUS APPLE VARIETY (ST. Casavela, A. Manughevici) |
| EXAMPLES FOR INDUCED VARIATION BY X- AND -RAYS IN COX ORANGE PIPPIN AND OTHER APPLE VARIETIES (M. Zwintzscher) |
| INDUCED MUTATIONS IN ANNURCA APPLE VARIETY (C. Fideghelli, F. Monastra, G. Della Strada, R. Quarta, B. Donini) |
| CHARACTER CHANGES IN INDUCED MUTANTS OF BRAMLEY'S SEEDLING APPLE (C.N.D. Lacey, A.I. Campbell) |
| GROWTH AND CROPPING OF SEVERAL GOLDEN DELICIOUS CLONES ON MM 1o6 (G. Engel) |
| A COMPARISON OF VIRUS-FREE CLONES OF GOLDEN DELICIOUS (H.J. van Oosten) |
| CLONAL SELECTION, FERTILITY AND FRUIT QUALITY OF GOLDEN DELICIOUS (S. Sansavini, D. Bassi) |
| HEAVY-CROPPING CLONES IN NON-VIRUS-FREE APPLE-VARIETIES (R. Silbereisen) |
| JUVENILITY AS A POSSIBLE CAUSE OF VARIATION IN THE NEW APPLE VARIETY KARMIJN DE SONNAVILLE (H.J. van Oosten, P. van Zweeden) |
| SIGNIFICANCE OF VARIOUS PARAMETERS FOR CLONAL SELECTION OF APPLES (W. Müller) |
| METHODS AND RESULTS OF CLONAL SELECTION IN VITICULTURE (P. Dr. H. Becker) |
| VIRUS INDUCED CHANGES IN THE GROWTH OF POME FRUIT TREES (A.I. Campbell, T.R. Sparks) |
| SUSCEPTIBILITY OF SEVERAL QUINCE ROOTSTOCKS TO LATENT VIRUSES (J. Lemoine, J. Huet) |
| CLONAL SELECTION IN PRUNUS MAHALEB ROOTSTOCKS (G. Baumann) |
| POSSIBLE SOURCES OF ROOTSTOCK VARIATION IN THE NURSERY (B.H. Howard) |
| GROWTH AND YIELD OF GOLDEN DELICIOUS ON M. 9A AND ON THREE OTHER M.9 ROOTSTOCK SOURCES (H.J. van Oosten) |
| COMPARISON OF M 9 CLONAL SELECTIONS WITH RESPECT TO GROWTH AND CROPPING OF THREE APPLE VARIETIES (G. Engel) |
| RESEARCH ON DIFFERENT VIRUS FREE CLONES OF THE ROOTSTOCK M 9 (G.L. Gilles) |
| ORGANIZATION OF THE N.A.K.B. AND ITS ACTIVITIES (G. Elzenga) |
