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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.doi:10.1017/s0016672300034960 fatcat:v5f4bsgla5hh5oglwnpu7gvbwq