It is typical of the haphazard way in which the British Empire grew up that the man who led the way in the exploration and settlement of Central Africa, which finally added so many thousands of square miles to the domains of the British Crown, should have gone to the country as a missionary. Livingstone arrived in Bechuanaland in 1841, and by the time of his death in 1874 he was world-famous for his exploration in the Zambesi and Tanganyika districts, and his work in arousing public opinion to the evils of the slave trade. In character, he is one of the noblest of the Empire-Builders of whom Principal Grant Robertson has told us in this series.