That this trade will be very much increased there is no doubt, since it affords occupation for the Lake marine in the winter, when the Lake ports are closed by ice.
On the western shore of Lake Michigan there are large settlements of Norwegians and Swedes, many of whom follow the Lakes as fishermen and sailors. Descendants of the old Northern sea-kings, they are as hardy and adventurous here as in their Scandinavian homes, and run their vessels earlier and later in the season than other men are willing to do.
Science might have anticipated, however, that vessels built for fresh-water navigation, and loaded at Lake ports, would have an advantage on the ocean over those loaded on salt water. As is the density of the water of any sea, so is the displacement, or the sinking of the vessel therein. Therefore a vessel can carry a larger cargo in salt water than she can in fresh; and so, a Lake craft, loading at Chicago as deep as she can swim, will find herself, when she reaches the ocean, much more buoyant and lively. So, also, as, the more sail a vessel carries, the deeper she penetrates the water, it follows, that, the more dense the water, the more sail she can carry.
In proof of these statements, the "Merchants' Magazine" tells us, that English vessels bound up the Black Sea take smaller cargoes than those going to the Mediterranean, because, the former being much less salt than the latter, vessels are less buoyant thereon, and can carry less. This difference in buoyancy will probably be enough to offset the higher seas and rougher weather of the Atlantic.
Thus it appears that this great basin extends through so many degrees of latitude that its lakes and streams connect with the mineral regions and pine forests of the North, the wheat- and corn-lands and cattle-ranges of the Middle States, and the cotton-and sugar-plantations of the South.
The pine forests of Maine, it is well known, have been for some time failing, under the great demand upon them; and the only resource will soon be in those of Wisconsin, Minnesota, and Michigan, from which many cargoes have been already sent to the Atlantic ports. The amount of lumber made in these pineries in 1860 is estimated at twelve hundred million feet, worth between eight and nine millions of dollars. Most of this goes to the country west of the Lakes,—to Chicago, to St. Louis, and even down the river to New Orleans. Since railroads have penetrated the great prairies and made them habitable, the demand for pine lumber has greatly increased both for building and fencing; and it has been estimated, that, if every quarter-section of land in Iowa and Illinois were surrounded with a "three-board" fence, it would consume every foot of pine-timber in Michigan.
As to the copper and iron mines of Lake Superior, many dabblers in fancy stocks are but too well acquainted with them, and many burned fingers testify against those investments of capital. Still, the amount of mineral is immense, and the quality of the purest; and these mines will no doubt pay well, if worked with skill and capital.
Since 1845, one hundred and sixteen copper-mining companies have been organized in Michigan, under the general law of the State; and the amount of capital invested in them is estimated at six millions of dollars. Most of this is lost. On the other hand, the "Cliff" and "Minnesota" mines have returned over two millions of dollars in dividends. The latter is said to have paid, in 1858, a dividend of $300,000 on a paid-up capital of $66,000. Mining is a lottery, and this brilliant prize cannot conceal the fact that blanks fall to the lot of by far the more numerous part of the ticket-holders.
The opening of the Sault Canal has very much aided in developing the resources of the Upper Peninsula. In 1845, the Lake Superior fleet consisted of three schooners. In 1860, one hundred vessels passed through the canal, loaded with supplies for the mining country, and returned with cargoes of copper and iron ore and fish. The copper is smelted in Detroit, Cleveland, and Boston. In 1859, 3,000 tons were landed in Detroit, producing from 60 to 70 per cent of ingot copper, being among the purest ores in the world.
The iron ore of this region is also of extraordinary purity; and for all purposes where great strength and tenacity are required, it is unrivalled, as the following table, showing the relative strength, per square inch, as compared with other kinds of iron, will prove:—