The passage discusses the geological and paleogeographical theories proposed by Dacqué, suggesting that the dense material under the Atlantic and Indian oceans has been exposed due to the displacement of lighter saline continents. This explanation resolves the problem of permanence in geology. The speculative section of Dacqué's work, which spans 200 pages, introduces major geological problems and paleography. The latter half of the work, focusing on sedimentary formations, paleogeographic maps, and stratigraphy, is considered more valuable by the reviewer. The review also mentions a book on "Plant Life" by Charles A. Hall, which is praised for its comprehensive coverage of plant life from the lowest to the highest forms, making it a useful resource for amateur botanists and educators. Additionally, the article lists several scientific articles from the Proceedings of the National Academy of Sciences, covering topics such as X-ray absorption, plant pathology, sea-anemone locomotion, and more.The passage discusses the geological and paleogeographical theories proposed by Dacqué, suggesting that the dense material under the Atlantic and Indian oceans has been exposed due to the displacement of lighter saline continents. This explanation resolves the problem of permanence in geology. The speculative section of Dacqué's work, which spans 200 pages, introduces major geological problems and paleography. The latter half of the work, focusing on sedimentary formations, paleogeographic maps, and stratigraphy, is considered more valuable by the reviewer. The review also mentions a book on "Plant Life" by Charles A. Hall, which is praised for its comprehensive coverage of plant life from the lowest to the highest forms, making it a useful resource for amateur botanists and educators. Additionally, the article lists several scientific articles from the Proceedings of the National Academy of Sciences, covering topics such as X-ray absorption, plant pathology, sea-anemone locomotion, and more.