Lewis Fry Richardson was one of the first to develop the systematic study of the causes of war; yet his great war data archive, Statistics of Deadly Quarrels, posthumously published, has yet to be fully systematized and assimilated by war-causation scholars. David Wilkinson has reanalyzed Richardson's data and drawn together the results of kindred quantitative work on the causes of war, from other as well as from Richardson. He has translated this...