Any observant American, from whatever point of the compass he may hail, who will take the trouble to pass through the Southern markets, both great and small, as we have done, and inquire where this article, that and the other came from, will be utterly astonished at the variety and quantity of Northern agricultural productions kept for sale. And this state of things is growing worse and worse every year. Exclusively agricultural as the South is in her industrial pursuits, she is barely able to support her sparse and degenerate population. Her men and her domestic animals, both dwarfed into shabby objects of commiseration under the blighting effects of slavery, are constantly feeding on the multifarious products of Northern soil. And if the whole truth must be told, we may here add, that these products, like all other articles of merchandize purchased at the North, are generally bought on a credit, and, in a great number of instances, by far too many, never paid for--not, as a general rule, because the purchasers are dishonest or unwilling to pay, but because they are impoverished and depressed by the retrogressive and deadening operations of slavery, that most unprofitable and pernicious institution under which they live. To show how well we are sustained in our remarks upon hay and other special products of the soil, as well as to give circulation to other facts of equal significance, we quote a single passage from an address by Paul C. Cameron, before the Agricultural Society of Orange County, North Carolina. This production is, in the main, so powerfully conceived, so correct and plausible in its statements and conclusions, and so well calculated, though, perhaps, not intended, to arouse the old North State to a sense of her natural greatness and acquired shame, that we could wish to see it published in pamphlet form, and circulated throughout the length and breadth of that unfortunate and degraded heritage of slavery. Mr. Cameron says: