This is one of the thematic world map sets from the rare 1861 edition of Johnson and Browning's Illustrated Atlas of the World. Features two maps drawn within a single border. The upper map depicts the world's co-tidal lines with notations regarding world tablelands and lowlands. The lower map very attractively displays the important ocean currents. Shading in the landmasses show the influence of various river systems. Represents plates 11 and 12 in the 1861 edition of Johnson and Browning's Illustrated Atlas…. This is the last edition of the Johnson Atlas to bear the 'Johnson and Browning' imprint. Subsequent editions reflect Ward's 1862 acquisition Ross C. Browning's shares in the firm.