====================================================== OBSERVATION STATION | March | April | May ------------------------+---------+---------+--------- | | | MEXICO | | | Tamps.: Tampico | 5,500 | 63,600 | Yuc.: Progreso | | 31,600 | | | | UNITED STATES | | | Fla.: Winter Park | | 6,200 | Ga.: Athens | | 2,600 | Thomasville | | 3,900 | Iowa: Ottumwa | | 15,300 | 54,600 Kans.: Lawrence | 51,600 | 5,400 | Ky.: Louisville | | 17,000 | 8,400 Murray | | 16,400 | La.: Baton Rouge | | 6,200 | Mansfield | | 4,900 | 5,200 Oak Grove | | 13,600 | 5,800 Miss.: Rosedale | | 6,800 | 5,800 Mo.: Columbia | | 1,400 | 10,300 Okla.: Stillwater | 2,700 | 1,900 | 3,000 Tenn.: Knoxville | | 15,200 | 9,000 Memphis | 3,600 | 7,900 | 7,000 Tex.: College Station | | 6,200 | 13,200 ------------------------------------------------------ [Illustration: FIG. 34. Stations at which telescopic observations were made in 1948.] _Gulf Migration: A Review of the Problem_ In view of the controversy in recent years pertaining to migration routes in the region of the Gulf of Mexico (Williams, 1945 and 1947; Lowery, 1945 and 1946), the bearing of the new data on the problem is of especial interest. While recent investigations have lent further support to many of the ideas expressed in my previous papers on the subject, they have suggested alternative explanations in the case of others. In the three years that have elapsed since my last paper dealing with Gulf migration, some confusion seems to have arisen regarding the concepts therein set forth. Therefore, I shall briefly re-state them.