1. In memoriam

   Announcement Pages: iv - iv

2. Warren H. Lewis, M.D. 1870–1964

   Announcement Pages: v - v

3. Charles Marc Pomerat

   • Donald E. Rounds

   Announcement Pages: vi - vi

4. Wilton R. Earle 1902–1964

   • Virgina J. Evans

   Announcement Pages: vii - vii

5. Editor's foreword

   • Clyde J. Dawe

   EditorialNotes Pages: ix - ix

6. Preface

   • George Yerganian

   EditorialNotes Pages: xi - xiii

7. Cytogenetic mechanisms and speciations of mammals

   • Robert Matthey

   The Chromosome Pages: 1 - 11

8. Photometric measurements of individual metaphase chromosomes

   • George T. Rudkin

   OriginalPaper Pages: 12 - 20

9. Consideration of metaphase chromosome parameters amenable to digital computer analysis

   • Frank H. Ruddle
   • R. S. Ledley

   OriginalPaper Pages: 21 - 25

10. Molecular morphology of the chromosome

    • Hewson Swift

    OriginalPaper Pages: 26 - 49

11. Specific effects of viruses and antimetabolites on mammalian chromosomes

    • Maimon M. Cohen
    • Margery W. Shaw

    OriginalPaper Pages: 50 - 66

12. Chromosome anomalies and chromosome structure

    • T. C. Hsu
    • Frances E. Arrighi

    OriginalPaper Pages: 67 - 71

13. Synthesis and turnover of nuclear proteins

    • David M. Prescott
    • Gordon E. Stone

    OriginalPaper Pages: 72 - 77

14. Mechanisms of repression and de-repression within interphase chromatin

    • John H. Frenster

    OriginalPaper Pages: 78 - 101