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Topographic mapping

The atlas comprises ten maps, of which the first three are devoted to the now well-known stages in topographic developmentyouth, maturity, and old age. The fourth illustrates a rejuvenated region, typifying the Piedmont plateau. The fifth map represents a young volcanic mountain, its subject being our magnificent volcanic cone, Mount Shasta. Moraines and drumlins, representing characteristic phases of ice-work, are shown on the sixth and seventh sheets, and a fiord coast, with its picturesque record of ice-work half drowned in ocean, forms the subject of the ninth sheet. The two remaining sheets illus-trate river flood-plains and a barrier-beach coast. The text includes an exposition of the conventions used in topographic mapping, and a full description of each of the sheets with a fuller interpretation of its features as records of geographic development. The issue of this folio marks an epoch in geographic teaching. Hitherto teachers have been limited in their work to glittering generalities in the books, or to the maze of little-understood realities in their sight; but now comes a series of American illustrations, shown in such detail that any teacher may correlate the features with those of his own landscape, and these are interpreted by the hand of a master so clearly that even the average pupil cannot fail to read aright.