Correspondence and papers concerning a conference held at the Cavendish Laboratory, Cambridge, 10 February 1971, 'To mark the occasion of the retirement of Dr W H Taylor as Reader in Crystallography at the Cavendish Laboratory', organised by the Crystallography Group of the Institute of Physics in collaboration with the Mineralogical Society. Includes: programme, report, list of delegates, abstracts, Helen Megaw's ms notes, and correspondence concerning the organisation of the conference and concerning Dr Taylor and his work (H M gave a paper with Martha J Kimball on the Crystal Structure of the Ammonium Felspar, Buddingtonite).