It was estimated that out of every one hundred lot shipped from Africa only about fifty lived to be effective laborers across the sea, and among the whites more seamen died in that trade in one year than in the whole remaining trade of England in two. The full realization of the horrors of the slave trade was slow in reaching the ears and conscience of the modern world, just as to-day the treatment of dark natives in European colonies is brought to publicity with the greatest difficulty. The first move against the slave trade in England came in Parliament in 1776, but it was not until thirty-one years later, in 1807, that the trade was banned through the arduous labors of Clarkson, Wilberforce, Sharpe, and others. Denmark had already abolished the trade, and the United States attempted to do so the following year. Portugal and Spain were induced to abolish the trade between 1815 and 1830. Notwithstanding these laws, the contraband trade went on until the beginning of the Civil War in America. The reasons for this were the enormous profit of the trade and the continued demand of the American slave barons, who had no sympathy with the efforts to stop their source of cheap labor supply. However, philanthropy was not working alone to overthrow Negro slavery and the slave trade. It was seen, first in England and later in other countries, that slavery as an industrial system could not be made to work satisfactorily in modern times. Its cost was too great, and one of the causes of this cost was the slave insurrections from the very beginning, when the slaves rose on the plantation of Diego Columbus down to the Civil War in America. Actual and potential slave insurrection in the West Indies, in North and South America, kept the slave owners in apprehension and turmoil, or called for a police system difficult to maintain. In North America revolt finally took the form of organized running away to the North, and this, with the growing scarcity of suitable land and the moral revolt, led to the Civil War and the disappearance of the American slave trade. There was still, however, the Mohammedan slave trade to deal with, and this has been the work of the nineteenth and early twentieth centuries. In the last quarter of the nineteenth century ten thousand slaves annually were being distributed on the southern and eastern coast of the Mediterranean and at the great slave market in Bornu. On the east coast of Africa in 1862 nineteen thousand slaves were passed into Zanzibar and thence into Arabia and Persia. As late as 1880, three thousand annually were being thus transplanted, but now the trade is about stopped. To-day the only centers of actual slave trading may be said to be the cocoa plantations of the Portuguese Islands on the west coast of Africa, and the Congo Free State.