Up to 1825 it was a mooted question whether the richest landowners would arise in New York, Philadelphia, Boston or Baltimore. For many years Philadelphia had been far in the lead in extent of commerce. But the opening of the Erie Canal at once settled this question. At a bound New York attained the rank of the foremost commercial city in the United States, completely outstripping its competitors. While the trade of these fell off precipitately, the population and trade of New York City nearly doubled in a single decade. The value of land began to increase stupendously. The swamps, rocky wastes and flats and the land under water of a few years before became prolific sources of fortunes. Land which had been worth a paltry sum ten or twenty years before sprang to a considerable value and, in course of time, with the same causes in a more intense ratio of operation, was vested with a value of hundreds of millions of dollars. This being so, it was not surprising that the richest landowners should appear first in New York City and should be able to maintain their supremacy. The wealth of the landowners soon completely eclipsed that of the shippers. Enormous as were the profits of the shipping business, they were immediate only. In the contest for wealth it was inevitable that the shippers should fall behind. Their business was one of peculiar uncertainties. The hazards of the sea, the fluctuations and vicissitudes of trade, the severe competition of the times, exposed their traffic to many mutations. Many of the rich shipowners well understood this; the surplus wealth derived from commerce on the seas they invested in land, banks, factories, turnpikes, insurance companies, railroads and in some instances, lotteries. Those shipping millionaires who clung exclusively to the sea fell in the scale of the rich class, especially as the time came when foreign shipping largely supplanted the trade hitherto carried in American cutters. Other shippers who applied their surplus capital to investments in other forms of trade and ownership advanced rapidly in wealth. CITY LAND THE SUPREME FACTOR.