Miss Jennifer Bak and I were on board' the Marine Biological Association's ship " S a r s i a " off Plymouth, Devon, near the Eddystone lighthouse, and saw a large migratory movement of b i r d s : in 4J hours' observation we counted some 1,600, mostly smallPasserines. Visibility at the start of the period was f to i mile, but the fog closed down to ioo yards at one stage. At no time was land visible, ...

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