Abstract
(1) Origin of the material and method of measturement. The settlement of Common Terns, which provided material for the present work, is one of old establishment on Blakeney Point, Norfolk. This is a shingle spit of some 8 miles in length on the north coast of Norfolk, about 12 miles west of Cromer. The colony is situated on the very end of the point, with water on three sides. Here the spit is a combination of dunes, salt marsh aind shingle, and for the most part the nests are found on the openi shingle on the seaward side of the dunes. Nests are plentiful in the embryo dunes in some years, though this year (1913) none were found thiere. The colony was more scattered than usual and covered the greater part of a mile of sea front. To avoid missing any clutches, Miss K. M. Parker, B.Sc., and Mr William Rowan divided the nestinlg area into suitable well marked plots and worked these one after another. Each of these again were worked in strips, till a patch was completed, when the workers moved on to a remote one, to give the birds a chance of settling down again. After measurement each egg was numbered with indelible ink, so that any one egg was never measured twice. In all 20:3 clutches were handled.
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