Authors wishing to have papers published in the J O U R N A L should com municate them to any one of the persons named above, choosing one in their own country where possible. Authors are urged to ensure that their papers are written clearly and attrac tively, in order that their work will be readily accessible to readers. Manuscripts should be typed in double spacing on one side of the paper only, with references listed at the end in alphabetical order of authors. Drawings should be done in

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... ian ink on plain white or transparent paper, and should not be larger than 15 in. by 24 in. Lettering should be shown clearly in pencil for reproduction b y the printer, and as far as possible information relating to a figure should be placed in the caption rather than on the figure. A typed list of captions should be provided at the end of the manuscript. Proofs of papers from overseas will usually be despatched to authors b y airmail. There is no charge for publication. Authors are entitled to receive 50 offprints of a paper in the J O T / R N A L free of charge, and additional offprints can be purchased if ordered in advance.