FOREST COMMISSIONER'S REPORT. 1 1 5 



feet in the tree, 326. Multiplying this figure 326 by the number 

 of trees counted on the plot will give an appropriate estimate 

 of the number of board feet on the quarter acre. Thus if we 

 are estimating pine and have counted 20 trees on the plot, the 

 estimate will be 6,520 feet board measure for the quarter acre. 

 If four or more plots have been taken in this way average the 

 results, and find an average stand for a quarter acre. Multi- 

 plying this by four, and then by the number of acres in the 

 woodlot we should have a good idea of what the stand will cut. 

 Estimates must of course be kept separate by species. 



Estimating with Volume Tables. 



If a more accurate estimate is desired it is possible to come 

 very close with the use of volume tables, but it involves more 

 care, more work, and — to get the best results — instruments 

 should be purchased for the work. (Those who care to pur- 

 chase instruments may obtain data as to their cost and use 

 upon application to this department.) 



In using volume tables every tree may be measured at breast 

 height on sample plots taken as in the preceding method, or they 

 may be measured on the whole area to be estimated. The 

 former method is perhaps the easier in practice. 



Select the sample plots as before. With a pair of calipers 

 (home made as described later) obtain the breast height diam- 

 eter of each tree of merchantable size on the plot. Find the 

 total height of several trees of different diameters to the near- 

 est ten feet. This may be done roughly by cutting a ten foot 

 pole and setting it up against the tree, then stand away from 

 the tree and estimate the number of times the pole will go up 

 the stem to the tip of the highest branch. Measure several plots 

 in this way, and the field work is accomplished, provided that 

 the number of acres in the woodlot is known or previously 

 obtained. 



The volume table given below is for white pine alone, taken 

 from the N. H. Forestry Report 1905-06, compiled from meas- 

 urements taken by the U. S. Forest Service and the State of 

 New Hampshire. The table gives the actual saw cut for trees 

 of different diameters breast high and height. 



The tables following are for spruce and hardwoods, and 

 should give fairly accurate results for Maine stands. 



