. Elementary lessons in the physics of agriculture . i,ni:i::'::iiili':iinuiuiirjii:iii ',ii/mMifm/i/f/////j//wjwi/;///j////im^^^^ Fig. AU too low, none of that water is available for plant growth. Permanent ponds and lakes are continuations of the water-table above the surface of the ground, and their levels lie at varying distances below the level of the water in the ground, the water-table rising usually as the dis- tance from these bodies of water increases and as the ground rises, as shown in Fig. 39.

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