MR. JOSEPH LUCAS, who died on April 20 last at the age of seventy-nine years, was educated at Westminster School and in 1867 joined the Geological Survey of Great Britain. During his nine years in the service he was employed in mapping the Carboniferous rocks in the West Riding of Yorkshire, and, later, the area in north-east Yorkshire, within which the Cleveland ironstone occurs. While in the West Riding he was much impressed with the great amount of water yielded by the Lower Carboniferous sandstones, and this probably led to his taking up the study of water supply and the profession of water engineer on his retirement from the Geological Survey.