60 LABORATORY MANUAL OF AGRICULTURE 



3. Shears. 



4. String. 



5. Loam soil. 



6. A small amount of green grass. 



7. A small amount of manure. 



Directions. Tie a piece of cheesecloth over the end of 

 each of the glass tubes. 



Fill the tubes with soil to a height of twelve inches. In 

 filling, the tubes may be placed on the desk or floor with 

 the end tied with cheesecloth down. 



Place the tubes in the tube rack in such a manner that 

 the lower ends are in the pan which is to be used later as 

 a container for water. 



Number the tubes. Treat the tubes as follows : 



No. 1. Place two inches of green grass cut into small 

 pieces in the tube over the top of the soil and fill the tube to 

 the top with loam soil. 



No. 2. Place two inches of finely pulverized barnyard 

 manure in the tube over the top of the soil and fill the tube 

 to the top with loam soil. 



No. 3. Fill with loam soil as a check. 



When all the tubes are filled and in position, fill the pan 

 with water to a depth of two inches. Take the exact time 

 of adding the water. 



Make readings of the height to which the water has risen 

 in each tube at the end of 15 minutes, 30 minutes, 1 hour, 

 1 day, 2 days, 3 days, 4 days, 5 days, and 6 days. 



Record your measurements in the accompanying outline 

 form. Describe fully the lesson that you have learned from 

 conducting this exercise. 



