It was in England that the first earnest effort to break up the slave-trade began. It was under the Stars and Stripes that the slavers longest protected their murderous traffic. For a time the effort of the British humanitarians was confined to the amelioration of the conditions of the trade, prescribing space to be given each slave, prescribing surgeons, and offering bounties to be paid captains who lost less than two per cent. of their cargoes on the voyage. It is not recorded that the bounty was often claimed. On the contrary, the horrors of what was called "the middle passage" grew with the greed of the slave captains. But the revelations of inhumanity made during the parliamentary investigation were too shocking for even the indifferent and callous public sentiment of that day. Humane people saw at once that to attempt to regulate a traffic so abhorrent to every sense of humanity, was for the nation to go into partnership with murderers and manstealers, and so the demand for the absolute prohibition of the traffic gained strength from the futile attempt to regulate it. Bills for its abolition failed, now in the House of Lords, then in the House of Commons; but in 1807 a law prohibiting all participation in the trade by British ships or subjects was passed. The United States moved very slowly. Individual States under the old confederation prohibited slavery within their borders, and in some cases the slave trade; but when our forefathers came together to form that Constitution under which the nation still exists, the opposition of certain Southern States was so vigorous that the best which could be done was to authorize a tax on slaves of not more than ten dollars a head, and to provide that the traffic should not be prohibited before 1808. But there followed a series of acts which corrected the seeming failure of the constitutional convention. One prohibited American citizens "carrying on the slave trade from the United States to any foreign place or country." Another forbade the introduction of slaves into the Mississippi Territory. Others made it unlawful to carry slaves to States which prohibited the traffic, or to fit out ships for the foreign slave trade, or to serve on a slaver. The discussion caused by all these measures did much to build up a healthy public sentiment, and when 1808--the date set by the Constitution--came round, a prohibitory law was passed, and the President was authorized to use the armed vessels of the United States to give it force and effect. Notwithstanding this, however, the slave trade, though now illegal and outlawed, continued for fully half a century. Slaves were still stolen on the coast of Africa by New England sea captains, subjected to the pains and horrors of the middle passage, and smuggled into Georgia or South Carolina, to be eagerly bought by the Southern planters. A Congressman estimated that 20,000 blacks were thus smuggled into the United States annually.