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MIGRATORY BIRDS 225 would, certainly furnish very useful information and. incidentally stimulate the interest of those enlisting in the undertaking. It is, of course, readily apparent that practically daily observations should, be made in order that the actual date of first arrival be known and also that data on merely a few best known birds, as the catbird, kingbird, purple martin, etc., will be useful as far as they go. To. all who will undertake such an exchange of data the writer, on.doi:10.1111/j.1949-8594.1906.tb00946.x fatcat:wxcunye6zzc2bb47xveq5pzpdm