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96 basing our estimates of population upon the development of trade, the advance of the arts, and the size of cities, we are apt to underrate the density of population which the intensive cultivations, characteristic of the earlier civilizations, are capable of maintaining—especially where irrigation is resorted to. As we may see from the closely cultivated districts of China and Europe a very great population of simple habits can readily exist with very little commerce and a much lower stage of those arts in which modern progress has been most marked, and without that tendency to concentrate in cities which modern populations show.

Be this as it may, the only continent which we can be sure now contains a larger population than ever before is Europe. But this is not true of all parts of Europe. Certainly Greece, the Mediterranean Islands, and Turkey in Europe, probably Italy, and possibly Spain, have contained larger populations than now, and this may be likewise true of Northwestern and parts of Central and Eastern Europe.

America also has increased in population during the time we know of it; but this increase is not so great as is popularly supposed, some estimates giving to Peru alone at the time of the discovery a greater population than now exists on the whole continent of South America. And all the indications are that previous to the discovery the population of America had been declining. What great nations have run their course, what empires have arisen and fallen in "that new world which is the old," we can only imagine. But fragments of massive ruins yet attest a grander pre-Incan civilization; amid the tropical forests of Yucatan and Central America are the remains of great cities forgotten ere the Spanish conquest; Mexico, as Cortez found it,