Mr. Richard Atkinson Peacock, an English engineer and geologist, whose special study was the investigation of the causes of volcanoes and of subsidences of the earth, died in London, February 2d, in the seventy-fourth year of his age. He was the author of books on "What is and What is not the Cause of Activity in Earthquakes and Volcanoes," "On Steam as the Motive Power in Earthquakes and Volcanoes," and on "Physical and Historical Evidences of Vast Sinkings of land on the North and West Coasts of France and Southwwestern Coasts of England."