204 Furestry Quarterly. 



and repeated their operations on the new ground. This method, 

 with slight modifications, allowed two crews to work together 

 rapidly and economically. No office force was necessary to 

 direct the work on such a simple system, nor could an office man 

 have been able to compute much of the data at first ; for, until 

 the work was well advanced, not enough of it was available to 

 allow accurate mapping. However, during the greater part of 

 September I was able to be in the office to begin the map and 

 compute data. Except for two more cruisers, who were sent 

 up in late August, the work was handled with 14 men. The sur- 

 veying crew was composed of a compassman, who could also 

 estimate if necessary, 2 chainmen, 2 axemen and a cook. The 

 combined surveying and estimating crew was of the same compo- 

 sition as the surveying crew, but with the addition of an esti- 

 mator and an assistant, who calipered his sample plots for him. 

 When the other two estimators came up they were placed with 

 the surveying crew and handled the estimating on both sides of 

 the line they were working on. The compassmen, rear chain- 

 men, and estimators were our own men ; while the rest of the 

 crew was hired in the vicinity- With these men and the single 

 crew of the lumber company on the boundaries, the work was 

 finished about the middle of September. 



The computation of data and making of the map took about 

 four weeks more. The estimates of the \ acre plots were figured 

 out by means of volume tables based on height and diameter 

 breast height. Height curves showing average heights by 

 diameter breast height were made up from observations in the 

 field of several hundred trees of each species. This is easy to 

 do and gives very good results in an uneven-aged forest such as 

 usually found in the spruce region of the Northeast, where 

 height is pretty constantly a function of the diameter. The 

 results of the \ acre plots were grouped together according to 

 the water sheds under which they came, totalled up and a sample 

 acre made for each water shed. The figures for this acre 

 multiplied by the acreage of the forested area of the watershed 

 gave the total estimate. These figures, together with a detailed 

 discussion of forest and lumbering condition, and a tabulation 

 of the number and kinds of trees per acre on each watershed 

 went to make up the report. This, together with the chain 



