Letter to the Editor

Mosaicity

Dear Bill

I hate to wake you from your well deserved slumbers by writing a 'Letter to the Editor', but the gremlin Editor modified the Glasgow IUCr Congress report on 'Cryo Preservation and Decay', resulting in a printed statement directly opposite in meaning to the one I intended. As submitted, the report on G. Bunick's talk read: 'Where cryo cooling has not reproduced room temperature mosaicity, crystals may be ...'. This was edited to 'If cryo cooling has reduced room temperature mosaicity, crystals may be ...'. If only we could reduce crystal mosaicity by cryo cooling! Unfortunately cooling often increases the mosaicity, and I have never heard of a case where the mosaicity at cryotemperatures is less than the room temperature value.

Elspeth Garman, U. of Oxford, UK