"The history of the United States shows, that while the slave States increase in population less rapidly than the free, there is a tendency in slave society to diffusion, greater than is exhibited by free society. In fact, diffusion, or extension of area, is one of the necessities of slavery; the prevention of which is regarded as directly and immediately menacing to the existence of the institution. This arises from the almost exclusive application of slave labor to the one occupation of agriculture, and the difficulty, if not impossibility, of diversifying employments. Free society, on the contrary, has indefinite resources of development within a restricted area. It will far excel slave society in the cultivation of the ground--first, on account of the superior intelligence of the laborers; and secondly, in consequence of the greater and more various demands upon the earth's products, where commerce, manufactures, and the arts, abound. Then, these arts of life, by bringing men together in cities and towns, and employing them in the manufacture or transportation of the raw materials of the farmer, give rise to an indefinite increase of wealth and population. The confinement of a free people within narrow limits seems only to develop new resources of wealth, comfort and happiness; while slave society, pent up, withers and dies. It must continually be fed by new fields and forests, to be wasted and wilted under the poisonous tread of the slave." Were we simply a freesoiler, or anything else less than a thorough and uncompromising abolitionist, we should certainly tax our ability to the utmost to get up a cogent argument against the extension of slavery over any part of our domain where it does not now exist; but as our principles are hostile to the institution even where it does exist, and, therefore, by implication and in fact, more hostile still to its introduction into new territory, we forbear the preparation of any special remarks on this particular subject. With regard to the unnational and demoralizing institution of slavery, we believe the majority of Northern people are too scrupulous. They seem to think that it is enough for them to be mere freesoilers, to keep in check the diffusive element of slavery, and to prevent it from crossing over the bounds within which it is now regulated by municipal law. Remiss in their _national_ duties, as we contend, they make no positive attack upon the institution in the Southern States. Only a short while since, one of their ablest journals--the _North American and United States Gazette_, published in Philadelphia--made use of the following language:--