Charles Darwin visited Bahia in 1832 on his famous voyage on the "Beagle". In 1835, Bahia was the site of an urban slave revolt, Malê Revolt of 1835 by the predominantly Muslim West African slaves at the time. The term "malê" was commonly used to refer to Muslims at the time from the Yoruba word "imale". The revolt is particularly notable as the greatest slave rebellion in the history of the Bahia. Under the Empire, Bahia returned 14 deputies to the general assembly and 7 senators; its own provincial assembly consisted of 36 members. In the 19th century, cotton, coffee, and tobacco plantations joined those for sugarcane and the discovery of diamonds in 1844 led to large influx of "washers" ("") until the still-larger deposits in South Africa came to light. A smaller boom hit Caetité in 1872 upon the discovery of amethysts there. The cattle industry of the interior led to the development of Feira de Santana before collapsing in a series of droughts.