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THE POPULAR SCIENCE MONTHLY.
young man of twenty-eight, published a map of this double-heart projection, making many corrections, especially in respect to the Continent of America, of which only one copy is known to exist, attached to an
Fig. 11.
edition of Ptolemy of 1578, that belonged to Mercator, and which has been liberally deposited by a member of our council, J. Carson Brevoort, in the library of our society.
All these maps, in their delineation of the outline of countries, were very defective, and especially in respect to the Continent of America. The accessions to geographical knowledge had become so vast and the
