The first textbook in English on oceanography, and offering a summary of what was known of the seas at the time and then-current theories of how the seas come to be as they are. Green cloth-covered boards, black titles to front board and spine, 206 pages plus three pages of publisher’s advertisements/catalogue. Frontispiece (map showing Salinity of the Surface of the Ocean) in colour, 42 other illustrations- maps, diagrams, images from photographs etc- in the run of the text. Condition: Some bumping and marking to the boards, text block firm, pages clean, bright and unmarked. Previous owners’ names to front free end paper. Note that a small dark area on the photograph of the frontispiece is a lighting artefact.