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THE POPULAR SCIENCE MONTHLY. 



young man of twenty-eight, published a map of this double-heart pro- 

 jection, making many corrections, especially in respect to the Continent 

 of America, of which only one copy is known to exist, attached to an 



edition of Ptolemy of 1578, that belonged to Mercator, and which has 

 been liberally deposited by a member of our council, J. Carson Bre- 

 voort, 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 



