Credited with articulating the theory of evolution, Darwin first attracting wide attention with the Journal of Researches into the Geology and Natural History of the Various Countries Visited by H.M.S. Beagle (1839). He published widely on topics of natural history, especially geology and botany, both before and after the two works on which his greatest fame rests, On the Origin of Species by means of Natural Selection (1859, subsequently revised), and the even more controversial The Descent of Man (1871).