RESEARCH METHODS IX STUDY OF FOREST ENVIRONMENT. 



I , 



After drying, each soil can should be immediately covered and 



eiglied . 



The moisture percentage should be determined on the basis of dry 

 weight of soil by deducting the can weight from the dry weight, 

 deducting the dry weight from the wet weight, and dividing the 



Fig. 2.— Ordinary soil cans, foi collection of moisture samples, with covers removed . Size J 1 , by -'' inches 



second remainder by the first remainder. Moisture percentages are 

 usually worked out to one or two decimal places. 



Soil cans in continuous use should be weighed at least twice each 

 season, preferably at the beginning and middle of their periods of u 

 Aluminum cans, while satisfactory in most respects, wear appre- 

 ciablv in a few months. 



