STATUS OF VOLUME B: RECIPROCAL SPACE. Uri Shmueli, School of Chemistry, Tel Aviv University, 69 978 Tel Aviv, Israel

The first edition of Volume B of International Tables for Crystallography was published in 1993, and work on the preparation of the second edition was soon commenced. The plans for the second edition included (i) minor revisions and corrections, (ii) major revisions of several existing chapters in order to extend their scope and/or update them with recent developments, and (iii) invitations of contributions on several relevant topics not treated in the first edition.

Most of the minor changes that did not require repagination were taken care of by the recent corrected second printing of Volume B, which will ensure its availability until the second edition is ready.

At the time of writing this Abstract most of the planned minor and major revisions of existing chapters have been received by the Editor and are being prepared for inclusion in the second edition of the volume. Their summary will be presented at the Open Meeting of the Commission on International Tables.

New contributions on the following topics were invited for the second edition of Volume B:

1. Space-group representations in reciprocal space.

2. Direct methods in electron crystallography.

3. Diffraction by polymers.

4. Reciprocal-space images of aperiodic crystals.

5. Dynamical theory of neutron diffraction.

At the time of writing this Abstract, advanced drafts of three contributions on the above topics have been received. Further developments are expected and will be reported at the Open Meeting.