The Social Welfare Forum

tion of papers presented at a two day inservice training course held at the School of Public Health in February, 1951. The course was planned to give particular emphasis to the determination and effect of toxic substances in drinking water from the particular viewpoint of the plant operator. The papers on sodium, nitrates, and plating wastes as toxic contaminants in ground and surface waters, radioactivity problems, and the little known subject of toxic plankton demonstrate the nature of the coverage. Any public health engineer, water chemist, or water plant operator will profit by studying these discussions of specialized water treatment problems. FRANCIS B. ELDER