To Study the Work of Worms on Soils A metal cage of ample size, fitted with glass front and glass partition. Dry and wet soil, or humus and sand may be placed. 30-245 side by side. This Cage clearly illustrates the work of worms under controlled conditions. First Year Science Leaflet, No. 2, with full instructions, supplied with the cage, or mailed on receipt of six cents. Apparatus for All Sciences. Supplies fully guaranteed. Cambridge Botanical Supply Company LABORATORY EQUIPMENT-ALL SCIENCES 1 to 9 Lexington Street Waverley, Mass. THE AMERICAN MATHEMATICAL MONTHLY OFFICIAL JOURNAL OF The Mathematical Association of America Is the Only Journal of Collegiate Grade in the Mathematical 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. 55 East Lorain St. OBERLIN, OHIO Please mention School Science and Mathematics when answering Advertisements. Crawford; "A Determination of the Efficiency of Production of X-Rays," Paul T. Weeks; "A Study of Apparent Specific Volume in Solution," Leroy D. Weld and John C. Steinberg; "The Absorption of Mercury Vapor by Tin-Cadmium Alloy," L. A. Welo. Popular Astronomy, for December; Northfield, Minn.; $3.50 per year: "Zenith Meteors," William H. Pickering; "Are the Spiral Nebulae Milky Ways?" M. G. Renaudot; “How to Determine the Correct Time Without Apparatus and Without Knowing the Meridian," Ernesto Nelson; "The 100-inch Telescope at Mount Wilson," Jennie B. Lasby. School Review, for November; University of Chicago Press; $1.50 per year, 20 cents a copy: "A Statistical Study of the Scholastic Records of 404 Junior and Non-Junior High-School Students," Paul Clifford Stetson; "Supervised Study and the Science Laboratory," Elliot R. Downing; "The Junior High School," L. McCartney; "The Supervision of ExtraCurricular Activities," Elmer Harrison Wilds. School World, for November; Macmillan Company, London, Eng.; 7s. 6d. per year: "The Secondary-School Examinations Council"; "Books on the Method, Philosophy, and History of Science," R. A. Gregory; "Modern Humanistic Studies," C. H. C. Osborne; "Schools and Public Libraries," John Swain; "Standardising and Competitive Examinations." FORTY-FIVE MILLION BARRELS OF SALT. The domestic consumption of salt in 1916 was 45,720,860 barrels of 280 pounds each, an increase of more than 7,000,000 barrels over the consumption of 1915. According to statistics compiled under the direction of R. W. Stone, of the United States Geological Survey, Department of the Interior, the domestic production of salt in 1916 was 45,449,329 barrels, the imports were 871,992 barrels, and the exports 600,461 barrels. This was an increase of 19 per cent in the quantity of salt produed. The total value of the salt was $13,645,947. Michigan, as usual, was the largest producer, and New York was a close second. The production, in barrels, by the leading states was as follows: Michigan, 14,918,278; New York, 14,087,750; Ohio, 6,706,193; Kansas, 4,564,793; California, 1,124,236. Perhaps the most marded feature in the salt industry in 1916 was the great increase in quantity of brine sold as such or used by chemical works, the increase being 37 per cent and the total production over 18,000,000 barrels. The production of rock salt increased over 17 per cent and amounted to 9,973,950 barrels, valued at $2,665,270. On the other hand, the production of evaporated salt increased only 5 per cent, to 17,575,629 barrels, but the value was $10,149,412, an increase of nearly 15 per cent. ATTENTION! The date of the expiration of each subscciption will be printed with the address on the wrapper. This date will be your receipt, and no other receipt will be sent unless specially requested. This does not apply to members os associations whose subscriptions are sent in by the treasurer of the association. Back Numbers Wanted. For copies in good condition of Vol. 2, No. 3, May, 1902, we will allow 30c on subscriptioe or 25c cash. For Vol. 1, No. 2, April, 1901, we will allow 50c. Caldwell and Eikenberry Elements of General Science McPherson and Henderson A First Course in Chemistry A book prepared especially to provide a brief course for beginning students in high schools who expect to pursue the subject no further. It is adequate, however, to meet college entrance requirements. $1.25. An Elementary Study of Chemistry Second Revised Edition SCHOOL TEXTBOOKS for the SECOND SEMESTER Are You Selecting the Best Books for Use in Your Schools next Semester? If not, Hasten, for Time Flies. An examination of our Textbooks for Secondary Schools will convince you that they rank among the best They include: FARM MANAGEMENT-Andrew Boss. This is a suitable text on agriculture. is simple. ALGEBRAS Williams and Kempthorne. Plenty of easy problems. Manner of approach ARITHMETIC OF BUSINESS-O. S. Smith (just out). A happy title. It treats the growing complexities of business. GEOMETRIES, PLANE AND SOLID-Williams and Williams. These books are made for teaching specific values. HIGH SCHOOL PHYSICS-Reed and Henderson. Pupils readily understand Reed and Send all orders to LYONS and CARNAHAN 623 S. Wabash Avenue CHICAGO 131 E. 23d Street Please mention School Science and Mathematics when answering Advertisements. BOOKS RECEIVED. Examples in Engineering, by F. E. Austin, Hanover, New Hampshire. 90 pages. 12.5×19.5 cm. Cloth. 1917. $1.25. By the author. How to Make Low Pressure Transformers, by F. E. Austin, Hanover, New Hampshire. 22 pages. 11.5×18 cm. 1916. $0.40. By the author. How to Make High Pressure Transformers, by F. E. Austin, Hanover, New Hampshire. 46 pages. 11.5X18 cm. Paper. 1917. $0.65. By the author. Examples in Magnetism, by F. E. Austin, Hanover, New Hampshire. 90 pages. 12.5x19 cm. Paper. 1916. $1.10. By the author. Preliminary Mathematics, by F. E. Austin, Hanover, New Hampshire. 169 pages +iv. 12×19.5 cm. Cloth. 1917. $1.20. By the author. Experimental General Science, by Willard M. Clute, Flower High School, Chicago. Pages vii +303. 12.5 X18.5 cm. 96 illustrations. Cloth. 1917. $1.25. P. Blakiston's Son & Co., Philadelphia. Mammalian Anatomy-with Special Reference to the Cat, by Alvin Davison, Lafayette College. Pages xi+243. 14.5X20 cm. Cloth. 1917. $2.00 net. P. Blakiston's Son & Co., Philadelphia. Differential and Integral Calculus, by H. B. Phillipps, Massachusetts Institute of Technology. Pages v+162+v+194. 12.5×19 cm. Cloth. 1916. John Wiley & Sons, New York City. Junior High School Mathematics, by William L. Vosburgh, Boston Normal School. Pages vii+146. 13×19 cm. Cloth. 1917. $0.75. The Macmillan Company, New York City. Laboratory Manual in General Chemistry, by William J. Hale, University of Michigan. 13.5×19 cm. Cloth. 1917. $1.50. The Macmillan Company, New York City. A Textbook in the Principles of Science Teaching, by George R. Twiss, State High School Inspector, Columbus, Ohio. Pages xxiv +486. 14.5× 20.5 cm. Cloth. 1917. $1.40. The Macmillan Company, New York City. Stony Island. A Plea for Its Conservation, by Zonia Baber, School of Education, University of Chicago. 16 pages. 15 X23 cm. Paper. 1917. The University of Chicago Press. BOOK REVIEWS. Third-Year Mathematics for Secondary Schools, by Ernst R. Breslich, Head of the Department of Mathematics- in the University High School, The University of Chicago. Pages xviii+369. 14×20 cm. With tables, $1.50, postage extra; without tables, $1.00. 1917. Logarithmic and Trigonometric Tables. Pages 118. 14x20 cm. 75 cents, postage extra. The University of Chicago Press. The third book of the series of textbooks on correlated secondary mathematics reveals the carefully planned continuation of the methods of the other two volumes. It begins with simple algebraic functions which are represented by graphs and used in the solution of problems in variation. This leads naturally to trigonometric functions in the second chapter. Then comes the solution of algebraic and trigonometric equations and other topics in algebra. The chapter on logarithms prepares for the solution of triangles, leading to the relations between the functions of several angles. Next comes the binomial theorem, progressions, and equations in two unknowns. The last ninety pages are devoted to areas of surfaces, volume, and theorems of solid geometry. A summary of the assumptions and theorems of geometry contained in the first two volumes is given in the final chapter. that we are prepared to give PROMPT SERVICE on Special Glass Apparatus as our glass blowing department is now in full operation We Carry Complete Laboratory Equipment for Chemistry, Physics, Biology and Agriculture SPECIALTIES: Pyrex Glassware, New Royal Guernsey Porcelain Ware, Baker's Analysed Chemicals, Whatman Filters, etc., etc. Write for our prices THE KAUFFMAN-LATTIMER CO. 44-46 E. Chestnut St., Columbus, Ohio FOUNDED 1881 INCORPORATED 1888 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- Each issue contains eighty columns. The magazine is indispensable to educational workers. 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