sity of Chicago, has been elected to the professorship of mathematics in Heidelberg University, Tiffin, Ohio.

Mr. Louis M. Sears, for several years instructor in the Hyde Park, Chicago, High School, has accepted a position in the geography department at the Chicago Normal College.

Professor A. A. Michelson, head of the department of physics, University of Chicago, has been commissioned as lieutenant-commander in the Navy.

Professor G. A. Miller, of the University of Illinois, and associate editor of this Journal, has accepted the chairmanship of a committee which is to make a survey of the mathematical instruction given under the auspices of the Y. M. C. A. at the various naval stations.

W. V. Lovitt, Ph. D., Chicago, of the mathematical department of Purdue University, has been appointed associate professor of mathematics in Colorado College.

Dr. Elias J. Durand has been appointed professor of botany in the University of Minnesota. Dr. Durand was formerly an instructor at Cornell, but since 1910 has held a professorship in the University of Missouri.

Mr. Franklin T. Jones, who for many years has been dean of the University School, Cleveland, and since its beginning Editor of the Department of Science Questions in this Journal, has accepted a position with the Glidden Company, Cleveland, manufacturers of paints and varnishes, as their chemist. Mr. Jones will continue to act as Editor of Science Questions.

Dr. F. S. Nowlan, of Columbia University, has been appointed instructor in mathematics in Bowdoin College.

Professor Julius Stieglitz, chairman of the department of chemistry at the University of Chicago, has been appointed as special expert in the United States Public Health Service of the Treasury Department. This will not involve his work at the university. The Government assigns him two assistants, who will be in the employ of the Public Health Service and will carry out their work in Kent Chemical Laboratory under Professor Stieglitz's direction.

Assistant Professor Harvey B. Lemon, of the department of physics, University of Chicago, has been commissioned captain in the Ordnance Department of the Army and assigned to duty as head of the instrument division of the proof department of the Aberdeen Proving Ground, Aberdeen, Md.

Professor J. H. Ransom, after eighteen years in Purdue University, has accepted the professorship of chemistry and director of the chemical laboratories in Vanderbilt University, Nashville, Tenn.

Professor Henry Blumberg, of the University of Nebraska, has accepted a position in the mathematical department of the University of Illinois. Professor E. V. Huntington, President of the Mathematical Association of America, has taken leave of absence from Harvard University and with the rank of major in the National Army is assigned to statistical study under the chief of staff with residence in Washington.

Professor A. D. Cole, professor of physics at Ohio State University, was in Washington during the summer, engaged in research work in the Bureau of Standards.

Dr. Richard C. Maclaurin, President of Massachusetts Institute of Technology, has accepted the appointment of director of college training, in charge of the students' Army Training Corps under the War Department's Committee on Education and Special Training, aiming to mobilize the higher institutions of learning.

Professor E. G. Lange of the Geography Department of the Whitewater Normal School, Wis., has resigned to enter Army Y. M. C. A. work. Mr. J. A. Nyberg, for the past year instructor in mathematics in the Hyde Park, Chicago, High School, has received an appointment as instructor in mathematics in the Artillery Department of the United States Army.

Professor W. R. McConnell, of the geography department of the Platteville, Wis., Normal School, has been elected head of the department of geography in the Teachers Training College, Miami University, Ohio.

Dr. A. D. Brokaw, assistant professor of mineralogy and chemical geology at the University of Chicago, has been called to Washington to take charge of the oil production east of the Rocky Mountains.

ARTICLES IN CURRENT PERIODICALS.

American Journal of Botany, for July; Brooklyn Botanic Garden, Brooklyn, N. Y.; $5.00 per year, 60 cents a copy: "A New Three-Salt Nutrient Solution for Plant Cultures," B. E. Livingston and W. E. Tottingham; "The Histology of the Phloem in Certain Woody Angiosperms," L. H. MacDaniels; "Cell Division by Furrowing in Magnolia," Clifford H. Farr.

American Mathematical Monthly, for June; 27 King Street, Oberlin, Ohio; $3.00 per year: "On the I-Centers of a Triangle," N. Altshiller; "Note on Continuous Functions," K. P. Williams; "Note on Functions Which Approach a Limit at Every Point of an Interval," E. W. Chittenden; The Nine-Point Circle Obtained by Methods of Projective Geometry," H. N. Wright; "Problems and Solutions."

Geographical Review, for August; Broadway at 156th Street, New York City; $5.00 per year, 50 cents a copy: "Alsace-Lorraine and Europe" (one insert map in color, five photos), Lucien Gallois; "Two Traverses Across Ungava Peninsula, Labrador" (one insert map, twelve photos), Robert J. Flaherty; "Traveling in China's Southland" (seven photos), Roy Chapman Andrews; "Portugal: The Country and The People" (six photos), William Thompson; "The Rumanians in Hungary" (three insert maps in color, one text map, two diagrams), B. C. Wallis.

Journal of Educational Psychology, for April; Warwick and York, Baltimore; $3.00 per year, 50 cents a copy: "An Experimental Study of Methods in Teaching High School Chemistry," William H. Wiley; "A Test in First-Year Chemistry," J. Carleton Bell; "The Range of Information Test in Biology. I. Physiology," N. M. Grier.

Journal of Geography, for May; Madison, Wis.; $1.00 per year, 15 cents a copy: "Finland," W. H. Twenhofel; "The Natural Resources of Australia," Stephen S. Visher; "The Project-Problem Method of Teaching Geography," Mendel E. Branom; "The Geography of Palestine," W. O. Blanchard; "The Magnesite Industry of Stevens County, Washington," C. E. Cooper; "Fur Seals and the Fur Seal Fisheries," Florence Whitbeck.

Popular Astronomy, for August-September; Northfield, Minn.; $3.50 per year: "Mars in 1911 and 1914" (Plate XV, Frontispiece), Latimer J. Wilson; "The Telescope and Mars" (Plates XV and XVI), Latimer J. Wilson; "Star Clusters," Russell Sullivan; "Nebular Evolution" (To be Continued), F. J. B. Cordeiro; "The Total Solar Eclipse of June 8, 1918" (Plate XVII), H. C. Wilson; "Total Solar Eclipse, June 8, 1918, Edwin B. Frost; "The Lowell Observatory Solar Eclipse Expedition,' V. M. Slipher; "The Application of Schaeberle's Method in the Photography of the Corona at Matheson, Colorado, June 8," (Plates XVIII, XIX, and XX), Edison Pettit and Hannah B. Steele; "The William C. Sproul Eclipse Expedition," John A. Miller.

Physical Review, for August; Ithaca, N. Y.; $6.00 per year, 60 cents a copy: "On Electromagnetic Induction and Relative Motion. II," S. J. Barnett; "Electronic Frequency and Atomic Number," Paul D. Foote;

"Some Properties of Metals under the Influence of Alpha Rays," A. C. McGougan; "On the Specific Inductive Capacity of Metals," Fernando Sanford; "Polarization Measurements at Wire Cathodes in Separately Ionized Gases," C. A. Skinner; "Simplified Theory of the Cathode Fall in Gases with Application to Plates and Wires," C. A. Skinner; "The Magnetic Properties of Some Rare Earth Oxides as a Function of the Temperature," E. H. Williams.

Psychological Clinic, for June; Woodland Avenue and 36th Street, Philadelphia; $1.50 per year, 20 cents a copy: "Orthogenic Cases XII: Obadiah, a Child with a Numerical Obsession," Sarah W. Parker; "Effects of Smoking on Mental and Motor Efficiency," Oscar J. Johnson, University of Minnesota.

School World, for May; Macmillan Company, London, England; 7s. 6d. per year: "Man-Power and the Schools"; "The Cost of Science Teaching in Secondary Schools," Douglas Berridge; "Graphical Interpretation,' R. Wyke Bayliss; "A Nature-Study Museum in a Rural School," Ernest R. Beale; "The Welsh University and the Secondary Schools," A. E. L. Hudson, B. A.; "The Position of Science in Schools"; "The CentralSchool System of London"; "Teachers and the Future of English Elementary Education."

CUT DOWN ON EXPENSE: LIVE THE SIMPLE LIFE.

Here are a few points on thrift given by the British Chancellor of the Exchequer which are worthy of emulation by Americans:

Lives must be lived more simply.

Personal, household, and business expenses must be reduced to the minimum.

Surplus weekly or monthly earnings, over necessary expenditures, must be invested straightway in war securities.

Current balances at the banks should be kept as small as possible and the money invested in war bonds.

Nobody's money can be neutral.

Money lent to the country fights for the country.

Money spent on luxuries and non-essentials is helping the enemy.[War Loan Reveille.

MICA SCHIST FOR FURNACE LINING.

Mica schist is one of the commonest kinds of metamorphic rock and consists essentially of mica and quartz, with which may be associated certain other minerals, such as garnet and staurolite. Owing to its marked foliation, its softness, and its generally unattractive appearance, it has not been greatly used as structural stone or as paving or crushed stone. It was once quarried near Bolton, Conn., for use as flagstone, but it was too soft to withstand the wear upon it in places of much travel.

The mica, to which the softness of mica schist is due, however, successfully withstands a very high temperature, and as the stone can be readily cut into blocks of the desired shape, mica schist has therefore been used considerably as furnace lining. The mica schist quarried for this use is found in eastern Pennsylvania, at places conveniently near the metallurgical plants in which it is required. The quantity of mica schist produced for this purpose in 1917 was 39,975 short tons, an increase of 6,739 tons, or 20 per cent, over 1916, according to statistics compiled by G. F. Loughlin, of the United States Geographical Survey, Department of the Interior. The value of the output in 1917 was $85,986, an increase of $38,682, or nearly 82 per cent. The greater increase in value was due to a rise in price from $1.42 to $2.15 a ton, which largely represents the increased cost of production.

CLASSROOM SAYINGS.

A virtual image is the reflected image of an object. A real image is the image of the object itself made smaller or larger or changed in some similar way, or the same.

Velocity of light is in an almost instantaneous; in glass it takes longer, for there is more space to travel through, especially in prisms.

A galvanometer is an instrument used to determine whether a body contains electricity or not. (If it does).

The two-fluid voltaic cell does not have so much induction as the onefluid voltaic cell.

Lightning is caused by the breaking of the electric sound in the clouds. It is a form of electricity. The only protective device which I know anything about is the lightning rod. I have heard that severe weather may make this type unsuccessful.

Draw a line through the point of contact of the two tangent circles exterminating in the circumferences. Equal arcs are sustained by equal chords.

"If one straight line meets another straight line, the sum of the adjacent angles will be equal."

"Side (a) is either equal, or it's not equal, or it's greater."

"A polygon is an angle of many sides."

"The dip of the earth is the angle at which the earth slants."

"An electrophorus is the instrument which is used in making electricity."

"Dielectric are electric waves that pass between the molecules as the wind passes through a forest."

"Dielectric is the faculty of not having electricity pass through readily."

“A right angle is an angle of 90° whose sides are equal and which has a common vertex."

CALL TO DUTY.

From the battle fields in France there comes an unspoken call that should find an answer in every American's heart. The recent great events in Europe, the successes of American arms on the fields of France should spur every American to greater effort.

Our people at home should not rest on the laurels of our soldiers in France. Every death on the field of honor in the line of duty and for our country's cause should be a call to us for every sacrifice and every exertion to aid the cause for which our soldiers are fighting, for which our soldiers have died.

Increase production, decrease consumption, save, and lend to the Government. Every cent lent to the United States is used to support, strengthen, and aid our soldiers in France.-[War Loan Reveille,

CENTRAL ASSOCIATION MEMBERS.

2125 Sherman Av., Evanston, Ill., Sept. 20, 1918.

My dear Fellow-Associationer:

Do you have a copyright on your educational knowledge? A few years ago one of the elementary teachers in a small town was talking with her principal about a wonderful grammar outline she had received in a summer course at the Normal School. She was willing that the principal should see it, but "Please don't show it to any of the other teachers for I paid my money for that and it is mine."

Happily the Central Association isn't built on that principle. We believe that every teacher should become 100 per cent efficient, and we believe that every member of the Association should help to attain this end.

We take for granted that you are glad to be a member of the Association, that you appreciate the privilege of associating with other progressive teachers at the annual meeting and of crossing intellectual swords with them, that you see in School Science and Mathematics a magazine unique and valuable, and that you appreciate the Proceedings as a concise summary of what transpired at the annual meeting. We also hope you approve of the attempt to make the Association of even wider influence through the Service Department.

This year we feel that a meeting of the Central Association is justified only as it takes account of war conditions and definitely strives to meet the changing conditions due to the World War. The program is based on this. Its central theme is "The Educational Demands of an Awakened Democracy." The committee on "Science and Mathematics in the High School of Tomorrow" expects to present individual reports to the various sections. Our president is emphasizing the importance of stressing this thought in his letters to the chairmen of the different sections.

Now, what are you going to do about it? Are you going to hoard your educational advantages, or are you ready to give the glad tidings to others that you have found a fountain of information and inspiration and want others to know about it? One of the men whom I most respect is the college professor who persuaded me to join certain educational associations. We want you to get at least one new member for the Association this year. Bring out your former Proceedings; lend your copies of School Science and Mathematics. When the new programs appear about the first of November they will be first class advertising material. Use them. If a teacher says he cannot attend the meeting, remind him he is all the more in need of the printed reports of the meeting and of the monthly magazine.

Remember it is the personal touch that wins, and we want to double our membership through you. Lend a hand.

Sincerely yours,

CHARLES S. WINSLOW, Chairman Membership Committee.

PRODUCTION OF FELDSPAR IN 1917.

The production of feldspar in the United States in 1917 amounted to 126,715 long tons of crude material, valued at $474,767. Eight states— North Carolina, Maine, Maryland, New York, Connecticut, Pennsylvania, California, and New Hampshire, named in order of magnitude of their production-contributed to this, the largest output ever recorded, it being 4 per cent, 42 per cent, and 7 per cent greater in quantity than the amounts for 1914, 1915, and 1916, respectively.