Its 20,000 miles of river and lake navigation--its 10,000 miles of railway--its 4,000 miles of canal--and its 11,000 miles of telegraphic wire--connect every part of its vast territory together, and give to an interminable continent the compactness of a small island. The facilities of communication, too, place at the command of the people of one part of the country the climate of every other. When the thermometer is below zero at New York, a journey of three days will bring the traveller to Savannah, where a genial temperature of 60 degrees, clear skies, and verdant nature, await him. And when a scorching sun is filling New Orleans with fever, the cool weather of the North, and upon the great lakes, is healthy and delightful. The apple bloomed at Natchez, in 1850, as early as the 24th March; while at Montpelier, in Vermont, it bloomed on the 10th June. The distance between the two places is but three or four days' travel. "One can hardly name a staple article of production which some part or other of the States will not grow--not as a mere garden curiosity, but as an article of profitable cultivation. The champagne of Cincinnati is beginning to be noted, and tea is under experimental cultivation in South Carolina. "The mineral resources of the country are enormous; and their development is only limited by the present want of capital to work them more efficiently. The coal of Pennsylvania--the iron in various parts of the Union--the copper of Lake Superior--the lead about Galena on the Mississippi; and lastly, the gold of California, which has already put in circulation a coinage of 15,000,000_l_. sterling--all these are but the first tapping of almost boundless resources. "In 1791, the public debt of the United States was $75,000,000. It is now, with six times the population, only $64,000,000; and in the same period, the imports of the country have increased from a value of $52,000,000 to $147,000,000; the exports from $19,000,000 to $145,000,000; and the tonnage of shipping from 500,000 tons to 3,300,000 tons. "The post-office statistics show how the transmission of intelligence has outstripped even the march of population. In 1790, the number of post-offices in the entire States was 75; in 1850, the number was 16,789. In 1790, there were 4,875 miles of post routes; in 1850, there were 167,703. In 1790, the whole post-office revenue was 37,905 dollars; in 1850, it was 4,905,176 dollars; which sum consisted of 4,082,762 dollars for letters, and 819,016 dollars for newspapers and pamphlets. The mileage run in transportation of letters in 1850, was 42,544,069 miles, at a cost, for transportation only, of a little more than twopence-halfpenny per mile. And the total number of letters conveyed was 67,500,000; 62,000,000 of which were paid, and 5,500,000 free and franked.