Eli Whitney's invention made illimitable cotton a substitute for costly and narrowly limited linen and in a great degree for good. It made it possible for every man in all the world to put a shirt on his back, a pair of sheets on his bed, a case on his pillow, and to clothe his wife in calico and his children in cottonade where before all these luxuries were denied to him and his by inexorable laws of economics. But incidentally that invention made slavery enormously profitable, where before it had been doubtfully profitable. Eliza Lucas of South Carolina, afterwards Eliza Pinckney, had sought to find profitable employment for her slaves by cultivating indigo. Other enterprising experimenters had explored other avenues of earning, but not one of them had found a way of making profitable the ownership of slaves until Eli Whitney devised a machine by the use of which any ignorant negro could remove the seed from three thousand pounds of cotton in a single day, where before one negro man or woman could remove the seed from only one pound or at the most a few pounds. From that hour forward, negro slavery became profitable in the South, and from that hour forth it stood as a "vested interest" with its influence as such in politics. Let us not misunderstand. The cultivation of cotton by free labor has exceeded in its productiveness by more than two to one, that cultivation under the slave system. As has already been set forth in these pages, the greatest cotton crop ever grown before the war with which we here have to deal amounted only to 4,669,770 bales, while under free labor the annual production rose to an average of more than 11,000,000 bales in the closing years of the century which saw the extinction of slavery. Yet there is no doubt or possibility of doubt that Eli Whitney's invention of the cotton-gin near the end of the eighteenth century made negro slavery profitable as it had never been before in this country. It enabled the planter to grow rich upon the proceeds of the labor of negro slaves whose industry had before produced scarcely more than enough to support themselves. It created a new era. It inaugurated a new epoch. It instigated a new sentiment in favor of slavery, where before the sentiment had been tending the other way.