The cry of the slaves.--The slaves of Abyssinia.--Sudan.--Arabia.--Sierra Leone.--Liberia.--Slavery in China.--Burma.--Nepal.--Other forms of servitude.--Forced labour.--The gallery of emancipators.--Slavery and the law.--Abolition, the new international effort.--The challenge to civilization.--Appendices: I. Slavery convention. II. Slave trade (consolidation) act, 1873.