2 They furnish the cheapest possible means

2 They furnish the cheapest possible means

2 They furnish the cheapest possible means

2. They furnish the cheapest possible means of removing too much water from the soil.

3. They are out of reach of all cultivating tools.

4. Surface water in filtering through the tiles leaves its nutritious elements for plant growth.

EXPERIMENTS

To show the Effect of Drainage. Take two tomato cans and fill both with the same kind of soil. Punch several holes in the bottom of one to drain the soil above and to admit air circulation. Leave the other unpunctured. Plant seeds of any kind in both cans and keep in a warm place. Add every third day equal quantities of water. Let seeds grow in both cans and observe the difference in growth for two or three weeks.

To show the Effect of Air in Soils. Take two tomato cans; fill one with soil that is loose and warm, and the other with wet clay or muck from a swampy field. Plant a few seeds of the same kind in each and observe how much better the dry, warm, open soil is for growing farm crops.