Science Teachers With the purpose of cooperating with Science Teachers and insuring the closest possible harmony between laboratory practice and commercial practice, we have prepared a series of Monographs. If you have not received a full set, any or all of them will be sent to you upon request. B-1-Suggestions Relating to the Selection of Electrical Measuring B-2-Elementary Electrical Testing in the High School Laboratory. B-4-Experimental Electrical Testing by Students. Weston Indicating Electrical are the recognized standard instruments of the world. As such they Weston Indicating Instruments include a great variety of groups for Portable or Switchboard service on A. C. or D. C. circuits, Instruments designed expressly for testing and laboratory use, for motor car and boat electrical systems, and many others for special purposes. Write for bulletins or catalogs describing those which interest you. Two Instruments of the Weston Miniature Precision Group. These wonderful little examples of the instrument maker's art are masterpieces of electrical and mechanical workmanship. They are accurate, dead-beat, extremely sensitive, effectively shielded and legible. Please mention School Science and Mathematics when answering Advertisements. AT SOUTH DAKOTA STATE COLLEGE AT SOUTH DAKOTA STATE COLLEGE are using gas made by The "Detroit" Combination Gas Machine AIR INTAKE for supplying gas in Departments of Domestic Science, Chemistry and Physics (Over 30,000 in daily use) Laboratory work can be done better, quicker and cheaper by using this gas. "Detroit" Laboratory Bunsen Burner When in need of Laboratory Burners think of the "DETROIT" The The style and design speaks for itself. Separate control of both Air and Gas. PRICES. Less than dozen lots, $1.25 each. DETROIT HEATING & LIGHTING CO. GAS REGULATOR Among the new texts in Geometry there is one which is leading all others in successful teaching of the subject. The new Stone-Millis Geometry is simple in that (1) It rearranges facts so that they are learned one at a time, in proper sequence. (2) It sensibly assumes the truth of certain statements, the proof of which is beyond the high school pupil. (3) It reduces to a more reasonable number the theorems requiring formal treatment. (4) It postpones until late in the course the incommensurable cases. The Stone-Millis Geometry is practical because it furnishes three times as many practical illustrations as any other Geometry. These applied exercises demonstrate in every case a geometric principle. The Stone-Millis Geometry is teachable because it uses the suggestive method in an entirely new way. Each theorem proved by the pupil is a lesson in method of attack. Analysis of the course of reasoning is taught by concrete illustrations. The Stone-Millis Geometry, Plane, Solid, Plane and Solid BENJ. H. SANBORN & CO., Publishers 623 South Wabash Avenue CHICAGO, ILLINOIS Please mention School Science and Mathematics when answering Advertisements. Push the Sale of War Stamps among your Pupils and Friends. CONTENTS for DECEMBER, 1918 No Numbers Published for Pig Iron Output Valued at More than a Billion Dollars-U. S. Geol. Survey.... Agriculture as Presented by Some of the State Normal Schools-Oren E. A Modern Quest for the Philosopher's Stone-Herbert Brownell.. Containers for Insects and Birds to Be Used for Class Work-Hattie J. Trade with our advertisers. They will deal squarely with you Member of the Educational Press Association of America No Numbers Published for JULY, AUGUST and SEPTEMBER. PRICE. The subscription price is Two Dollars and Fifty Cents a year, if paid in advance; single copies 30 cents. 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