. The principles of agriculture, a text-book for schools and rural societies . Fig. 10. How to show that plants giveoff moisture. Fig. 11. To deteriiiiiie how muchwater a soil can hold. causes a liquid to ascend or descend or move laterally throughvery small openings or tubes, or the interstices between fine par-ticles of solid matter, or by which it is held to the surface of theparticles themselves. The teacher should illustrate capillarity bythe familiar experiment of standing tubes of glass in water. Thesmaller the bore of the tul>e, the higher the water rises. The oilrises in the wick b
. The principles of agriculture, a text-book for schools and rural societies . Fig. 10. How to show that plants giveoff moisture. Fig. 11. To deteriiiiiie how muchwater a soil can hold. causes a liquid to ascend or descend or move laterally throughvery small openings or tubes, or the interstices between fine par-ticles of solid matter, or by which it is held to the surface of theparticles themselves. The teacher should illustrate capillarity bythe familiar experiment of standing tubes of glass in water. Thesmaller the bore of the tul>e, the higher the water rises. The oilrises in the wick by means of capillarity. The principle may be THE MOIST UKK IN THK SC)li> 51) illustrated by filling straight (or argand) lamp chimneys withoompacted dry soil and standing them in a dish of water. 68a. Film moisture can be illustrated by dipping a marbleinto water and observing the skin or film of moisture adhering toall sides. The most satisfactory conditions of soil moisture existwhen each soil grain is covered by a film of water. The char-acter of film moisture is chan
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