The fact that moisture can move only very Slowly in the wet sur face soil would make it necessary to run water over the soil for a very long time' in order. That any considerable portion might be absorbed. This is not practicable, for the experiment with a dry subsoil showed that water from the surface penetrated almost as deep in a few minutes as it did in 10'days, so that the increase in the amount of moisture absorbed where the water stands for any considerable length of time over that taken in when the soil is simply covered would be so Small as to be negligible. After a field has once been covered with water little benefit can result from having water con tinne to stand on or flow over the soil.

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