The other evidence chosen is that of Chief of Police Crowley of San Francisco, whom the author knows to be a careful observer and conservative judge of his observations. General Brinkerhoff, of the National Conference of Charities and Correction of Canada and the United States, is authority for the statement of Chief Crowley, which was in effect as follows: "I have not known of the arrest of a single person who has had the advantage of a good kindergarten training, and I believe that it is perfect protection against criminal tendencies."[1] [1] See corroborative testimony page 221. Now here is the evidence of a distinguished philanthropist and also of an honored and successful officer of the corrective branch of government from widely separated communities, one of them the most mixed in its constituent parts of any city of America, and where frontier development has offered extreme temptation for criminal tendencies, coupled with the fever of speculation. In the "Report of Committee on History of Child-Saving," now unfortunately out of print, which was published in 1893 by the National Conference of Charities and Correction, we find a contribution, based on the San Francisco character-building work, by the revered, the late Sarah B. Cooper. We esteem the paper of Mrs. Cooper so highly, as being a most convincing argument for social quarantine, that we have begged permission to print it as a chapter of this brief. It carries words of burning truth that should not be "out of print," but on the contrary should be graven deep in the memory of all citizens for whose common good Mrs. Cooper labored in the field of practical Christian experiment. Mr. Hastings H. Hart, general secretary of the National Conference of Charities and Correction, who is in close communication with six hundred correspondents who are especially interested in child-saving work, assures us that if there is no obstruction offered to the free choice of children, and facilities are available for proper training, practically all can be made useful citizens, and that by coöperation to attain that aim, social quarantine is possible. The present headquarters of the National Conference of Charities and Correction is in Chicago, in the Montauk Building, 115 Monroe Street. The Conference is doing a great work in stimulating and organizing reforms. The annual subscription--$2.50--entitles members to the published proceedings of the Conference, which are an epitome of the history of progress towards social quarantine. There is no more profitable coöperation than by means of membership in this association.