1. Such a class you must have, or you would not have that other class which leads progress, civilization, and refinement. </span><span>2.We use them for our purpose, and call them slaves. </span><span>3.The highest proof of what is Nature's law. </span><span>4.I will not characterize that class at the North by that term; but you have it; it is there; it is everywhere; it is eternal.</span>