The publication in 1839 of his "Journal and Remarks" (now known as "The Voyage of the Beagle") brought him success as an author, and in 1842 he published his first major scientific book, "The Structure and Distribution of Coral Reefs", setting out his theory of the formation of coral atolls. He wrote out a sketch setting out his basic ideas on transmutation of species, which he expanded into an "essay" in 1844, and discussed his theory with friends as well as continuing with experiments and wide investigations. In the same year the anonymous "Vestiges of the Natural History of Creation" brought wide public interest in evolutionary ideas, but also showed the need for sound evidence to gain scientific acceptance of evolution.