Some bands may bear the inscription "Notify F. and Wildlife Service, Washington, D. C." or "Notify Biological Survey, Washington, D. C.," and on the smaller sizes these may be abbreviated to "F. and W. Serv. Wash. D. C." or "Biol. Surv. Wash. D. C." All reports of the recovery of banded birds will be acknowledged with the name of the bird, the date and place where it was banded, and the name and address of the bander. The banding of birds is done by regular officers of the United States and Dominion Services, by biologists and technicians of the States and Provinces, and by volunteer cooperators who are specially licensed under the provisions of the Migratory Bird Treaty Act. The banding of migratory waterfowl is largely restricted to Federal and State officers and is done chiefly in refuge areas. Most nongame birds are banded by volunteer cooperators who are scattered over the United States, Canada, and Alaska. The bands are furnished without charge by the Service but each station operator supplies his own traps and other equipment. To participate in this work, certain rules must be adhered to. Applicants for banding permits: 1. Must be at least 18 years of age. 2. Must be thoroughly competent to identify positively all local birds. 3. Must have their ability vouched for by three recognized ornithologists or by other banders. Application blanks for the Federal permits required may be obtained from the Bird Banding Office, Patuxent Research Refuge, Fish and Wildlife Service, Laurel, Md., or, in Canada, from the Chief, Dominion Wildlife Service, Ottawa, Ontario. _Bibliography_ Since almost every faunal paper on birds has a bearing on the subject of migration, only a few can be listed in this publication. Those included were selected to aid the student wishing to pursue the subject further and to cover not only all cited in the text but also others consulted and used in its preparation. Allard, H. A. 1928. Bird migration from the point of view of light and length of day changes. Am. Naturalist 62, pp. 385-408. Austin, O. L., Jr. 1928. Migration-routes of the Arctic tern (_Sterna paradisaea_ Brunnich). Northeastern Bird Banding Assn. Bull., vol, 4, pp. 121-125. Baird, S. F. 1866. The distribution and migration of North American birds. Am. Jour. Sci., vol. 41, pp. 78-90, 184-192, 337-347. Bergtold, W. H. 1926. Avian gonads and migration. The Condor, vol. 28, pp. 114-120. Bissonette, Thomas Hume 1936. Normal progressive changes in the ovary of the starling (_Sturnus vulgaris_) from December to April. The Auk, vol. 53, pp. 31-50, illus. 1939. Sexual photoperiodicity in the blue jay (_Cyanocitta cristata_). Wilson Bull., vol. 51, pp. 227-232, pis. 9-11. Clark, Austin H. 1925. Animal flight. Sci. Monthly, vol. 20, pp. 5-20. Clarke, W. E. 1912. Studies in bird migration. 2 vol., illus. London. Cooke, May Thacher