“ Phil. Mag. xiii. pp. 365-373, 1857; “The Geology of Bolivia and Southern Peru,” Journ. Geol. Soc. xvii. pp. 7-62, 1861; “The Mineralogy of Chile,” Phil. Mag., 1865; “Researches in British Mineralogy,” Phil. Mag., 1867–1868. His observations on the geology of South America were given in a masterly essay, and these and subsequent researches threw much light on igneous and metamorphic phenomena and on the resulting changes in rock-formations. He also contributed important articles on chemical geology to the Chemical News and Geological Magazine (1867 and 1868) . ”