Our efforts to obtain reliable information respecting another very important branch of profitable industry, the lumber business, have also proved unavailing; and we are left to conjecture as to the amount of revenue annually derived from it in the two grand divisions of our country. The person whose curiosity prompts him to take an account of the immense piles of Northern lumber now lying on the wharves and houseless lots in Baltimore, Richmond, and other slaveholding cities, will not, we imagine, form a very flattering opinion of the products of Southern forests. Let it be remembered that nearly all the clippers, steamers, and small craft, are built at the North; that large cargoes of Eastern lumber are exported to foreign countries; that nine-tenths of the wooden-ware used in the Southern States is manufactured in New England; that, in outrageous disregard of the natural rights and claims of Southern mechanics, the markets of the South are forever filled with Northern furniture, vehicles, ax helves, walking canes, yard-sticks, clothes-pins and pen-holders; that the extraordinary number of factories, steam-engines, forges and machine-shops in the free States, require an extraordinary quantity of cord-wood; that a large majority of the magnificent edifices and other structures, both private and public, in which timber, in its various forms, is extensively used, are to be found in the free States--we say, let all these things be remembered, and the truth will at once flash across the mind that the forests of the North are a source of far greater income than those of the South. The difference is simply this: At the North everything is turned to advantage. When a tree is cut down, the main body is sold or used for lumber, railing or paling, the stump for matches and shoepegs, the knees for ship-building, and the branches for fuel. At the South everything is either neglected or mismanaged. Whole forests are felled by the ruthless hand of slavery, the trees are cut into logs, rolled into heaps, covered with the limbs and brush, and then burned on the identical soil that gave them birth. The land itself next falls a prey to the fell destroyer, and that which was once a beautiful, fertile and luxuriant woodland, is soon despoiled of all its treasures, and converted into an eye-offending desert.