In the preparation of this work, which the author believes to be the first attempt to present a purely scientific and sociological treatment of any great disaster, he has received invaluable assistance. A few grateful lines can ill-express his obligation to his Professors of the Department of Sociology. To Professor F. H. Giddings the volume owes its inspiration and much of its social philosophy. To Professor A. A. Tenney it owes its present form and structure and any literary excellence it may possess. Professor R. E. Chaddock has read the manuscript throughout and has contributed many helpful suggestions. Professor S. M. Lindsay has read the chapter on Social Legislation, and Professor R. S. Woodworth of the Department of Psychology, that on Disaster Psychology. The author is under special tribute to Professor H. R. Seager, and to Professor Tenney, who most cheerfully sacrificed part of a summer vacation to read and revise the manuscript and proof. Without the walls of the University there are also those who have given aid. The author gratefully acknowledges the assistance of Dr. Edward T. Devine of New York, of Mr. C. C. Carstens of Boston, of Mr. Thomas Mackay, of Ottawa, and of Miss E. M. A. Vaughan, of the St. John Public Library. He has enjoyed the cooperation of many friends and fellow-townsmen of Halifax. He desires to thank particularly, Miss L. F. Barnaby, of the Halifax Citizens' Library, Miss J. B. Wisdom, of the Halifax Welfare Bureau, Rev. W. J. Patton of St. Paul's Church, Mr. W. C. Milner, of the Public Archives of Canada, Mr. L. Fred. Monaghan, Halifax City Clerk, Mr. G. K. Butler, Supervisor of Halifax Schools, Mr. R. M. Hattie, Secretary of the Halifax Town-Planning Commission, Dr. Franklin B. Royer, Director of the Massachusetts-Halifax Health Commission, Mr. E. A. Saunders, Secretary of the Halifax Board of Trade, Mr. E. H. Blois, Superintendent of Neglected and Delinquent Children, and last of all and most of all his friend of many years, Mr. A. J. Johnstone, editor of the _Dartmouth Independent_. S. H. P. COLUMBIA UNIVERSITY, NEW YORK, OCTOBER, 1920. CONTENTS INTRODUCTION PAGE The "catastrophe" in sociological literature 13 The "catastrophic view" _vs._ progress in evolution 14 Factors in social change 15 The stimuli factors 16 What crises mean 16 Communities and great vicissitudes 19 Causes of immobility 19 Catastrophe and progress 21 Historic cases suggested for study 23 CHAPTER I CATASTROPHE AND SOCIAL DISINTEGRATION