Kristallographie has now appeared, after 32 years, in its seventh edition (Crystallography in its third). The book has changed greatly over these 32 years, and, I hope, for the better! I have always been very keen that it retain its character as a basic text, suitable for use at an early stage in a course of study. I also attach great importance to the exercises โ now more than a hundred in number โ which give many possibilities for deepening the study.