The most strikinR feature of this chart is the concentration of "high" and "superior" yields of wheat within the middle ranges of annual and pre-harvest precipitation and of annual temperature.

1. Of the 60 areas characterized by an annual precipitation of less than 20 inches, only 18 had long-time average yields of wheat above 14 bushels. These 18 are dryfarming areas in Canada and the western United States.

•Il

CORRELATION CHARTS

■||

a: <

o o

>

o o

<

(/)

FOUR SMALL CITIES IN OREGON AND WASHINGTON

FOOD HOUSING

^50 600 750 1000 6O0

123 250 373 100 130 200

FOUR COUNTIES IN PENNSYLVANIA AND OHIO 100 150 aoo

MEAN IN DOLLARS

Dorothy S. Brady. "Variations in Family LivinK Expenditures." Journal of thr American Statiitiral Association. Junr 19J8.

Standard Deviations of Fannily Expenditures in Relation to The Mean in Four Small Cities in Oregon and Washington, and Four Counties in Pennsylvania and Ohio, 1935-1936.

GRAPHIC PRESENTATION

CENTS

BUSHEL

(A)

,A

\

• •27

f

•34

• • •31 '33

••32

30 40 50 60 70 80 90

PRODUCTION OF SWEETPOTATOES ( MILLIONS OF BUSHELS)

DEVIATION FROM A

(B) '

^'

^^23

■27

•

• •30

•

•

• •31

'34

•

300 320 340 360 380 400 420

PRODUCTION OF POTATOES ( MILLIONS OF BUSHELS)

90 100 no 120 130 140 150

INDEX OF FOOD PRICES (AV. JULY-JUNE; I9IOI9I4'IOO ) U. S. Department of ARriculturc, Bureau of AKricultural Economics.