The purpose of Volume C is to provide the mathematical, physical and chemical information needed for experimental studies in structural crystallography. Volume C covers all aspects of experimentation techniques, using all three principal radiation types, from the selection and mounting of crystals and production of radiation, through data collection and analysis, to the interpretation of results. Eleven chapters have been revised, corrected or updated for the third edition. Audience: This Volume is an essential source of information for all workers using crystallographic techniques in physics, chemistry, metallurgy, earth sciences and molecular biology.