A personal definition of crystallography

Dear Editor,

I have noted from the IUCr Newsletter (Vol. 10, No. 2) that Z. f. Krist. would publish a 'personal definition of Crystallography'. Unfortunately, I was late in submitting the paper and hope that my definition can be announced at your periodical:

'Crystallography is the science concerned with reasons, laws, and consequences of space ordering of atoms, atomic groups (molecules, clusters, etc.), and, generally, a great deal of identical material objects of the one or several sorts'.