Wis. Geol. and Natural Hist. Survey. 
Plate III. 
SHOWING ROLLING SURFACE OF VILAS SAND. 
While erosion is usually not a serious problem on sandy soils, these 
fields, being - somewhat steeper than the average, have washed badly. 
This is due chiefly to furrows which ran up and down the slope along 
the edge of the fields. The surface water, during heavy rains col¬ 
lected in these furrows and soon cut deep channels. With a little 
care this could have been prevented. Furrows should be run with the 
contour of the hills. 
SHOWING TYPICAL LEVEL SURFACE OF PLAINFIELD SAND. 
This soil is loose and open in structure, somewhat droughty and de¬ 
ficient in both nitrogen and the mineral plant foods. With proper 
methods of fertilization and cultivation, however, it can be made to 
produce fair crops as indicated in this view. 
