The turnpike era overlaps the period of the building of national roads and canals and the beginning of the railway age, but it is of greatest interest during the first twenty-five years of the nineteenth century, up to the time when the completion of the Erie Canal set new standards. During this period roads were also constructed westward from Baltimore and Albany to connect, as the Lancaster Turnpike did at its terminus, with the thoroughfares from the trans-Alleghany country. The metropolis of Maryland was quickly in the field to challenge the bid which the Quaker City made for western trade. The Baltimore-Reisterstown and Baltimore-Frederick turnpikes were built at a cost of $10,000 and $8000 a mile respectively; and the latter, connecting with roads to Cumberland, linked itself with the great national road to Ohio which the Government built between 1811 and 1817. These famous stone roads of Maryland long kept Baltimore in the lead as the principal outlet for the western trade. New York, too, proved her right to the title of Empire State by a marvelous activity in improving her magnificent strategic position. In the first seven years of the nineteenth century eighty-eight incorporated road companies were formed with a total capital of over $8,000,000. Twenty large bridges and more than three thousand miles of turnpike were constructed. The movement, indeed, extended from New England to Virginia and the Carolinas, and turnpike companies built all kinds of roads--earth, corduroy, plank, and stone. In many cases the kind of road to be constructed, the tolls to be charged, and the amount of profit to be permitted, were laid down in the charters. Thus new problems confronted the various legislatures, and interesting principles of regulation were now established. In most cases companies were allowed, on producing their books of receipts and expenditures, to increase their tolls until they obtained a profit of six per cent on the investment, though in a number of cases nine per cent was permitted. When revenues increased beyond the six per cent mark, however, the tendency was to reduce tolls or to use the extra profit to purchase the stock for the State, with the expectation of ultimately abolishing tollgates entirely. The theories of state regulation of corporations and the obligations of public carriers, extending even to the compensation of workmen in case of accident, were developed to a considerable degree in this turnpike era; but, on the other hand, the principle of permitting fair profit to corporations upon public examination of their accounts was also recognized.