The recent history of the Baltic involves problems of great interest and importance, and promises to afford considerable help in solving the mysteries of the later geological changes in Western Europe. It is therefore worth a closer study than has been extended to it in this country. Perhaps I may be permitted to condense in the Geological Magazine what has been written about it in late years by the Scandinavian geologists, and to add some inferences of my own. I am especially indebted to De Geers and Munthe, the latter of whom has written quite an ideal monograph on one section of the story in the Bulletin of the Geological Institution of the University of Upsala, vol. ii.