61 



below the materials loosened, and hence held their positions and the soil 

 embraced bj' them. 



Very much more extensive than the slides themselves was the creep of 

 the hillside soils. The effect of the creep was the removal of thousands 

 of tons of soil on a single slope to the distance of a few inches or a foot or 

 so down the slope. 



The one great lesson taught 1\v the excessive rainfall of March, 1913, 

 so far as the steep slopes of southeastern Indiana are concerned, is that 



Extensive Slide on a Steep Slope Covered witii Blue Grass Sod. 



the only adequate protection against disastrous soil loss is in the refor- 

 estation of such localities with the larger varieties of trees. The plant- 

 ing of such trees as the black walnut and the white oak and others with 

 very large tap roots is especially desirable. 



