Jury-Law books

0 per cent
From 40 to 60 inches 11.0 per cent
From 60 to 80 inches 9.0 per cent
From 100 to 120 inches 4.0 per cent
From 120 to 160 inches 0.5 per cent
Above 160 inches 0.5 per cent
Total 100 per cent

Fifty-five per cent, or more than one half of the total land surface
of the earth, receives an annual precipitation of less than 20
inches, and must be reclaimed, if at all, by dry-farming. At least
10 per cent more receives from 20 to 30 inches under conditions that
make dry-farming methods necessary. A total of about 65 per cent of
the earth's land surface is, therefore, directly interested in
dry-farming. With the future perfected development of irrigation
systems and practices, not more than 10 per cent will be reclaimed
by irrigation. Dry-farming is truly a problem to challenge the
attention of the race.



CHAPTER IV
DRY-FARM AREAS.--GENERAL CLIMATIC FEATURES


The dry-farm territory of the United States stretches from the
Pacific seaboard to the 96th parallel of longitude, and from the
Canadian to the Mexican boundary, making a total area of nearly
1,800,000 square miles.


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