THE WEIGHT OF SOIL PER CUBIC FOOT 41 



Directions. Cut disks of cheesecloth to cover the open- 

 ings in the bottom of the tubes. Place the cheesecloth 

 in position in the tubes. Number and weigh the tubes. 

 Record weight in accompanying outline form. 



Fill the four tubes level full with air-dried gravel, sand, 

 loam, and clay, respectively. Compact the soils in each 

 tube by holding the filled tube three inches above a book 

 and letting the tube drop bottom downward on the book. 

 Compact the contents of each tube by letting it drop from a 

 height of three inches three times. 



After compacting, again fill the tubes level full and stroke 

 with a straight edge. 



Weigh and record weight of tube and soil. 



Empty the tubes, refill with the same soil, and weigh 

 again as a duplicate determination. 



Record duplicate weighings. 



Measure the diameter and height of the tubes and com- 

 pute the number of cubic inches of soil contained in each. 



Calculate the weight of the soil per cubic foot. 



Calculate the weight of an acre of the different soils to a 

 depth of one foot. 



Tabulate all weighings and calculations in the following 

 outline form. 



