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CLASS 108-DEVELOPMENTAL AVERAGE MARK 3.3
CLASS 127-LABORATORY MANUAL-AVERAGE MARK 2.2

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CLASS 127-ORAL LABORATORY-AVERAGE MARK 5.1
CLASS 108-LABORATORY MANUAL-AVERAGE MARK 3.2

LOST

FOUND

The old traditional method of presenting mathematics has been lost in the readjustment of the curriculum to meet present-day tendencies.

Modern Junior Mathematics

By Marie Gugle

A brand-new series which handles the essential fundamentals from the student's viewpoint and introduces new material in accordance with the modern trend.

The books are in entire harmony with the recommendations of the National Committee on Mathematical Requirements.

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10,000 Problems and Questions

Fifteen pamphlets compiled or edited by Franklin T. Jones Price each pamphlet 50 cents, except Second Latin and English, 60 cents each. Sample copy to a teacher half price when money is sent with the order. Write for discounts on orders for class use.

Algebra

Chemistry

Physics

Plane Geometry
Solid Geometry
Trigonometry

Other Pamphlets

French A, French B; German A, German B; First Latin, Second Latin; English; Question Book on History; Medieval and Modern European History.

American History and Civics

General Science

Ready Soon

Ancient History

In Preparation

General Information

75,000 Already Sold. In Use in 500 Schools.

Address

THE UNIVERSITY SUPPLY & BOOK CO. 10109 Wilbur Ave., Cleveland, Ohio.

Please mention School Science and Mathematics when answering Advertisements.

NEW OIL AND GAS MAP OF PENNSYLVANIA.

The latest addition to the Geological Survey's series of maps showing the oil fields in the States of the Union is the map of Pennsylvania. This map agrees with others of the series in showing the features of greatest interest to oil and gas operators in distinctive colors and the purely geographic features in a subdued black. The oil fields are shown in green, the gas fields in red, and the pipe lines and refineries in violet, but the cities towns, streams, railroads, etc., are shown in the subdued black.

The map shows strikingly the comparatively small part of the State that is producing oil and also the zonal arrangement of the oil and gas fields, with a broad belt that yields much gas and little oil lying east of a similar broad belt that yields oil with only a little gas.

The scale of the map is 1,500,000, or about 8 miles to the inch, and its dimensions over all are about 24 by 31⁄2 feet. It may be obtained from the Director, U. S. Geological Survey, Department of the Interior, Washington, D. C., at a cost of 50 cents a copy.

A BIG LOST LAKE IN NEVADA.

During comparatively recent geologic time a great lake flooded a number of the valleys in northwestern Nevada. This lake has now almost completely disappeared, but geologists have named it, in its entirety. Lake Lahontan, in honor of Baron La Hontan, one of the early explorers of the headwaters of the Mississippi. At the time of its greatest expansion, according to the United States Geological Survey, Department of the Interior, this ancient lake covered 8,400 square miles. The deepest part of Lake Lahontan, which was 880 feet deep, was the site of the present Pyramid Lake, one of its remnants, so that its surface stood about 500 feet above the surface of Pyramid Lake. The ancient lake had no outlet except the one that led straight up, its waters being dissipated entirely by evaporation.

A large area a few miles north of Winnemucca, Nev., is covered with sand dunes that were formed since Lake Lahontan disappeared. These dunes are fully 75 feet thick, and their steeper slopes are on the east side, indicating that the whole vast field of sand is slowly traveling eastward. The march of this sand is irresistible, and its progress has necessitated a number of changes in the roads in the southern part of Little Humboldt Valley during recent years. In some places in this region the telegraph poles have been buried so deep that they have had to be spliced in order to keep the wires above the crests of the sand dunes. The sand is of a light creamy-yellow color and forms beautifully curved ridges and waves that are covered with an artistic fretwork of wind ripples.

ANNUAL MEETING OF THE CENTRAL ASSOCIATION OF
SCIENCE AND MATHEMATICS TEACHERS.

AUDITORIUM, SOLDAN HIGH SCHOOL, ST. LOUIS, MO.,
NOVEMBER 25 AND 26, 1921.

Promptly at ten o'clock the annual meeting was opened with music by the Soldan High School Orchestra.

The program was carried out according to announcement:

Address of Welcome, John Rush Powell, Principal Soldan High School, St. Louis.

Response for the Association, Chas. H. Smith, Assistant Principal Hyde Park High School, Chicago, Ill.

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DISSECTING INSTRUMENTS

Send for Catalog 21-S

Listing a full line of Instruments, Microscopes, Prepared Slides, Magnifiers, Microtomes and Supplies.

E.W.A.ROWLES CO.

•MANUFACTURERS.

SCHOOL FURNITURE AND SUPPLIES
2345-51 SO. LA SALLE ST.

CHICAGO, ILL.

Please mention School Science and Mathematics when answering Advertisements.

WARG

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