This travel narrative, published to coincide with Sir Bartle Frère's expedition to Zanzibar in 1873, recounts George Sulivan's experience on board several anti-slave trade patrol cruisers in the Indian Ocean, in the 1860s. Travelling through the islands and along the coast of East Africa from Mozambique to Cairo, Sulivan records his observations of slave trading activity there. He describes the different types of dhows operating in the Indian Ocean, and the strategies they used to get past the naval patrols. Sulivan called the slave trade inefficient, "uncivilized" and "a curse to mankind" (21). One of his cruisers captured about 300 slaves, and their testimonies were recorded via interviews with a translator (181-86). In conclusion, Sulivan recommends the establishment of a colony of freed Africans at Dar es Salaam, and a treaty with the Sultan of Zanzibar abolishing the slave trade and slavery.