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Can you reorganize your Mathematics Course by

following tradition? No! Modern Junior Mathematics By Marie Gugle

attacks the problem boldly and places your mathematics
course on a sound, practical, modern and up-to-date basis.
The books are in entire harmony with the recommendations
of the National Committee on Mathematical Requirements.

Book One: Seventh Year...... 80c
Book Two: Eighth Year. 90c

Book Three: Ninth Year...... $1.00
Send for free circular: Three Year Course in Mathematics for

Junior High Schools

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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 seh. Sample copy to a teacher half price when money is sent with the order.

Write for discounts on orders for class use.
Algebra

Plane Geometry
Chemistry

Solid Geometry
Physics

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.

Ready Soon
American History and Civics

Ancient History

In Preparation
General Science

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

Address
THE UNIVERSITY SUPPLY & BOOK CO.

10109 Wilbur Ave., Cleveland, Ohio.

these meation School Science and Mathematics when answering Advortisements.

CHILDREN CAN BE TAUGHT CORRECT DIET IN SCHOOL.

A campaign to improve the diet standards of children of school age was recently conducted in Akron, Ohio. As a preliminary step, 1,011 children were weighed and measured under the direction of school authorities. Of these children 58 per cent were underweight, nearly a fourth of these being more than 10 per cent underweight. On the suggestion of the home demonstration agent of the United States Department of Agriculture and state agricultural college the children were given one-half pint of milk in the middle of the morning, and the other underweight children were merely taught how to improve their weight themselves. At the close of the second month it was found that 67 per cent of all the children underweight had made some gain.

At this time the agent met with the mothers of these children to demonstrate the results of improved diet and to explain how to plan balanced meals. In this demonstration 60 boys and girls who had the largest underweight percentages were selected for physical examinations, made by a physician in the presence of the parents. Each mother was told what the proper average weight for age and height is. She was given a health card on which to record her child's health habits for a week. The record was to show the number of hours of sleep daily and a complete diet list, which was to be filled out and used according to instructions given by the home demonstration agent. Other health habits, such as deep breathing and teeth brushing were also to be recorded.

The demonstration was followed by weekly conferences of the mothers of the underweight children with the doctor, nurse, and home demonstration agent, at which the health record for the week was examined, the weekly weights taken, and additional instruction and advice given the parents. As a result almost every mother reported intelligent interest on the part of the children in the food work.

“We never sit down to the table, but that the question arises as to whether or not we are having the right things to eat,” said one mother, in speaking of the excellent results achieved through this piece of nutrition work.

MEXICO. “Mexico, so close that one is tempted to consider it a domestic rather than a foreign field, is nonetheless a country filled with people and customs strikingly foreign to those of the United States," says a bulletin issued from the Washington, D. (., headquarters of the National Geographic Society.

“And it is a country of contrasts. It is exceedingly rich in natural resources, yet a large part of its population lives in dire poverty. It had a university before John Harvard was born, yet the great mass of its prople are illiterate. Modern equipages and machines are to be seen side by side with the most primitive vehicles and devices. And desert sands and tropical jungles can be found almost within a stone's throw of eternal snow.

Four TIMES THE AREA OF FRANCE. “The Mexico of today has an area of about 770,000 square milesapproximately a quarter that of the United States. Once the area of Mexico was two-thirds that of the big republic to the north. The difference is made up of territory (half that of the old Mexico) that has been transferred from Mexico to the United States-Texas, New Mexico, Arizona, Nevada, Utah, and parts of Wyoming, Colorado, Kansas and Oklahoma. Yet Mexico as it exists today is four times the size of France. Roughly, half of the long-shore line of the Gulf of Mexico is Mexican; and

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344. Demonstration Aneroid Barometer. Consists

of a high grade barometer movement mounted on a base and enclosed within an air tight glass dome. This instrument is desirable for demonstrating the mechanism of Aneroid Barometers. It is large enough for the lecture table, and because of the glass dome all parts are plainly visible. The glass dome is air tight except for the opening through the rubber tube. By blowing in or drawing out air the pressure is varied and indicated by the barometer indicating hand. When not in use on the lecture table it may be used as a regular barometer. Scale calibrated in English and Metric System. Price, each........

-$24.75

Send for Scientific Catalog 21-S
A complete stock of high grade appara-
tus and supplies enables us to ship orders
without delay. Satisfaction and safe
delivery guaranteed.

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.

its Pacific coast is nearly a thousand miles longer than that of the United States exclusive of Alaska.

“But though Mexico has an area of great extent, what may be called the real Mexico is much smaller. Throughout the history of Mexico, both before the coming of the Spanish conquerors and since, the culture of the country and its center of population have been on the great central plateau which rises between the two oceans, and particularly in the south central part of that region. A section there occupying not more than one-sixth of the country contains nearly two-thirds of the total population. This portion of the country, of which the Valley of Mexico and the City of Mexico are near the center, has a delightful climate. Blankets are used at night the year round, but seldom at any time of the year is an overcoat needed at midday.

“The northern portion of Mexico is largely occupied by deserts. The southern section is tropical-a country of steamy moisture and jungles. Both coasts are hot and unpleasant throughout a large part of their extent. It is natural enough, therefore, that the central plateau has played an important part in the country's history.

Few CITIES AND MANY VILLAGES. "Mexico is essentially a rural country. Mexico City, the capital, with its million inhabitants, is the only city of large size within the country's borders. Between the metropolis and the next largest city, Guadalajara, is a great gulf, for the latter with its population of 120,000 is only the size of Nashville, Tenn., or Salt Lake City. Monterey, the greatest city of northern Mexico, and third in the country, is approximately the size of Harrisburg, El Paso, or San Diego San Louis Potosi is the size of South Bend, Ind.; while Vera Cruz, the greatest port of the Republic and fifth city, is smaller than Tampa, Florida, or Charleston, S. C. Salina Cruz and the other Pacific ports are little more than villages with extensive docks. As a rule the cities of Mexico are not manufacturing centers but derive what importance they possess from being the markets for the surrounding agricultural country or mining regions.

"While Mexico is largely agricultural, and therefore rural, its country life is strikingly different from that with which farm-bred residents of the United States are familiar. Seldom is an isolated farmhouse to be found; most of the tillers of the soil live in little villages and go back and forth to their work, usually on the land of others. These innumerable villages give one the impression of being standardized and are difficult to tell apart. They are made up of low, rectangular flat-topped huts of mud bricks or adobe, and are huddled closely together. Between the forbidding walls of these tomb-like dwellings, the tropic sun beats down on a narrow, dusty street.

"In addition to these more or less independent villages of the common people there are to be found in parts of the country the haciendas or great ranches of the landed proprietors, on which are other groups of the inevitable flat-roofed huts, the dwellings of the ranch's peons. In the hot country of the South are extensive plantations of bananas, rubber trees, cacao and other special tropical products. These plantations are often operated by foreigners, and on them small armies of day laborers are employed.

THE ORIGINAL AMERICAN "MELTING Pot." "Because Mexico for hundreds of thousands of years has formed a bridge between North and South America, it had become something of a 'melting pot' before the United States took up that role. And after the arrival of the European conquerors the racial mixture was made still more complex by the addition of Spanish blood. In the Mexico of

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WITH

SPENCER DELINEASCOPE

MODEL 3

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IDEAL STEREOPTICON for both
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dead and alive.
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One Spencer Delineascope does it.

SPENCER
BUFFALO

Spencer's Delineascope Model 3 for both lantern slides and opaque objects. 1,000 Watt Mazda bulb illuminant.

Price $185.00 SPENCER LENS COMPANY

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