EXERCISE 71 

 1^ THERE ANY SOLUBLE MATERIAL IN THE SOIL? 



Materials Fertile sail; a large funnel; filter paper; distilled water; a glass dish. 



Directions. Fold and place filter paper against the inner surface of the funnel ; then fill the 

 funnel with soil. Place the funnel with its tube above a clean glass dish, pour distilled water 

 upon the soil, allowing the water plenty of time to pass through the soil and the filter paper into 

 the dish below. Set the dish in a warm place and evaporate to dryness. Explain the presence of 

 anything which remains in the dish after the water has evaporated. 



Additional problem. Is there danger of soils losing fertility through drainage ? 



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