OFFICIAL JOURNAL OF The Mathematical Association of America Is the Only Journal of Collegiate Grade in the Mathematical Field in This Country This means that its mathematical contributions can be read and understood by those who have not specialized in mathematics beyond the Calculus. The Historical Papers, which are numerous and of high grade, are based upon original research. The Questions and Discussions, which are timely and interesting, cover a wide variety of topics. The Book Reviews embrace the entire field of collegiate and secondary mathematics. The Curriculum Content in the collegiate field is carefully considered. Good papers in this line have appeared and are now in type awaiting their turn. The Notes and News cover a wide range of interest and information, both in this country and in foreign countries. The Problems and Solutions hold the attention and activity of a large number of persons who are lovers of mathematics for its own sake. There are other journals suited to the Secondary field. and there are still others of technical scientific character in the University field; but the monthly is the only journal of Collegiate grade in America suited to the needs of the non-specialist in mathematics. Send for circulars showing the articles published in the last two volumes. SECRETARY OF THE ASSOCIATION 55 East Lorain St. OBERLIN, OHIO The School World A Monthly Magazine of Educational Work and Progress Price 6d monthly Yearly Volumes 7/6 Net each The School World provides full information on all Leading educational authorities and teachers of ac- The magazine is indispensable to educational workers London: MACMILLAN AND CO., Limited NEW YORK: THE MACMILLAN COMPANY Please mention School Science and Mathematics when answering Advertisements. 11 The entire set of back numbers of School Science and Mathematics makes the most valuable help on modern and progressive Science and Mathematics teaching which is possible for one to possess. See price list on inside back cover. Fifty cents each will be paid for back numbers of May, 1902, Vol. II, No. 3. TEACHERS OF BIOLOGY! 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