P L A T E S should only be included where absolutely essential. They should be supplied as unmounted glossy prints; a n y lettering to be inserted on t h e m is best indicated on a separate sketch. Please do not damage prints by writing heavily on their backs or by using paper clips. P R O O F S . TWO sets of single-sided page proofs, together with the typescript, of each paper will be sent to the author. The printers' marked proof should be returned after correction to the Executive Editor.

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... essive alterations, other than corrections of printers' errors, may be disallowed or charged to the author. Correction should be made using the symbols in British Standard 1219: 1958, or its shortened version B.S. 1219C: 1958. Proofs of short notes will only be sent to authors if time permits. O F F P R I N T S . Fifty offprints of each paper, but not of short notes, are provided free of charge. Additional offprints m a y be ordered on the form sent out with proofs, provided this is returned within seven days of receipt; these will normally be limited to a maximum of 150. available at https://www.cambridge.org/core/terms. https://doi.