The material for the fourth, revised edition of Volume A was submitted
to the
Technical Editor in January 1994; first proofs were read in September,
second
proofs in December 1994. The new edition is scheduled for publication
in the
spring of 1995. It will contain a complete set of new diagrams for the
plane
groups and the space groups, as well as new explanatory diagrams in
Section
2.6. Furthermore, this edition will contain the new graphical and
printed
symbols for the `double glide plane
*e*', introduced by the IUCr in 1992.
This
has necessitated major changes in Section 1. A list of errata to the
third
edition of Volume A (1992) will appear in *Acta
Cryst*. (1995), A**51**,
592-595.

Th. Hahn, Editor

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Updated 14th February 1997

**Copyright © 1994 International Union of Crystallography**