They stand in the Gulf of Guinea–those two islands of San Thomé and Principe where the slaves die–about 150 miles from the nearest coast at the Gaboon River in French Congo. San Thomé lies just above the equator, Principe some eighty miles north and a little east of San Thomé, and a hundred and twenty miles southwest of Fernando Po. San Thomé is about eight times as large as Principe, and the population, which may now be reckoned considerably over 40,000, is also about eight times as large. It is difficult to say what proportion of those populations are…