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Chicago Tribune, "The 1938 Chart Book," February 22, 1938. SCALE .8

B. The Price of Memberships on the New York Stock Exchange from 1900 to 1937. Compare this method of presenting high-low data with 28 SB.

COMPARISONS WITH TWO CURVES

•30 '35 1920 25

I93e DATA ARE PRELIMINARY

U S Drpartmcnt of Agriculture, Bureau of AKricultural Economics. SCALE .8

Production and Farm Prices of Strawberries in the United States from 1918 to 1938.

This chart shows an effective way of comparing two curves. Note the combination of the shaded curve and the dotted-line curve.

GRAPHIC PRESENTATION

THOUSANDS OF 21 22 23 24 25 26 27 28 29 30

J2 33 34 35

WPA. National Research Project. "Summary of Findings to Date," March 1938.

A. Movement to and from Farms in the United States from 1920 to 1935.

This information is also given in B below. Here the emphasis is on the population movements to and from the farms. These two charts illustrate the technique of shading different sections of the same chart for different emphasis.

1 1 1 1 1

LEAVING FARMS FOR CITIES AND VILLAGES

NET MOVEMENT TO FARMS

U S Department of ARriculture. Bureau of Auriculfural Economics.

B. Movement to and from Farms in the United States from 1920 to 1937.