SIRS,--We are hoping to collate information about visible migration over, and on the shores of, the Mediterranean. Very little has been published on the subject and no doubt a good many unpublished records, especially those made on voyages, are in existence. If any one would be so good as to communicate such records t o us, he may rest assured t h a t full acknowledgement would beSIRS,--Mr. Hinde's...

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