EXERCISE A-21. TO COMPARE THE MOVEMENT OF 

 WATER THROUGH DIFFERENT SOILS. 



Equipment: Four tall brass cylinders or tin cans with 

 perforated bottoms; four graduated bottles; cheesecloth; 

 samples of sand, muck and clay soil. 



Method: Number the four cylinders or cans and cover 

 the bottom of each with a layer of cheese cloth. After 

 supporting them over the graduated bottles, fill the cans 

 to within one inch of the top, as follows: No. 1, sand; 

 No. 2 mixture of half sand and half muck; No. 3 clay; 

 No. 4 mixture of half clay and half sand. 



Taking each can separately, slowly pour water on the 

 surface of the soil and note the time required for the water 

 to come through and l^egin to drip from the bottom. 

 Continue to pour on water and measure the amount 

 which comes through during the next ten minutes. If the 

 sand is coarse it may be necessary to shorten the time 

 to one minute for that material. 



What kind of soil is most likely to drain out naturally? 

 What kind of soil reciuires tile drainage? 



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