L. J. Procter, Popular Science Monthly (1873)
“ Livingstone's aim was to abolish the slave-trade; and, as long as they felt that, the Portuguese on the Zambési, themselves prospering, would do all they could to throw moral obstacles in his way. They would simply not cooperate; the better disposed would sit still with their slaves around them; the less scrupulous would combine to misrepresent the country, cry down the people, and talk as loudly as possible of the hopelessness of the inland trade. Their slave-drivers all the while might be putting their gangs into the fork-stick shackles ”
