RESEARCH METHODS IX STUDY OF FOREST ENVIRONMENT. 



77 



After drying, each soil can should be immediately covered and 

 weighed. 



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, for collection of moisture samples, with covers removed. 



Size 2J by 21 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 

 use. Aluminum cans, while satisfactory in most respects, wear 

 appreciably in a few months. 



