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the washing formula. The occurrence of lime soaps in soft-water laundries is pointed to as far more widespread than is commonly thought. It was proved that Calgon is not injurious in any way to textile fabrics nor to colors, and that its use effects an economy in washing supplies. R.
Heavy Soil Erosion.--(U. S. Department of Agriculture, Clip Sheet No. 798.) Unless the land is terraced, continuous cropping of cotton in the highly erosive soil which makes up approximately 36,ooo,ooo acres in Oklahoma and Texas will result in wearing all the top soil away in 30 years and leave the stiff clay subsoil which produces only about half as much, the work of the United States Department of Agriculture soil-erosion experiment station at Guthfie, Okla., indicates.
The experiments at this station, known as the Red Plains station, show that unless some grain or grass crop is grown the soil loss amounts to 32.5 tons an acre a year and that I4 per cent. of the rainfall is lost by run-off. Where grass was grown on similar slopes, the soil loss was only 6o pounds to the acre and only I. 7 per cent. of the rain was lost.
Of about I6,ooo,ooo acres of this erosive type of soil in cultivation in Oklahoma, about I3,OOO,OOO are suffering seriously from erosion and about 7,000,000 of these have reached the gullying stage. In the last IO years 1,5oo,ooo acres have been ruined by deep washing and gullying.
To combat this erosion the Department in urging more grass crops, terracing, and soil-saving dams to stop gullying, and similar practices.
R.
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