S2 THE LAECH. 



explain itself; and without sucli data very serious 

 errors are frequently committed. 



Column 6 contains the number of each class or 

 species of trees in each plantation, and on comparing 

 any class (as oak) of any individuaf plantation thinned 

 after date of report, it can be seen at once how many 

 trees of that class still remain in the plantation. The 

 advantages of the classification and arrangement thus 

 shown are very great, as it enables the proprietor 

 or forester to know at any time the exact number of 

 each species of tree in the plantation, or upon the 

 whole estate. 



Column 7 contains the total number of trees in each 

 plantation, and the total number of what is upon the 

 whole estate is shown at the bottom of the column. 



Column 8 contains the total value of each planta- 

 tion, whether as mature and fit for cutting down, or 

 young and growing, and valuable only as a standing 

 crop. 



Column 9 contains the average annual growth each 

 plantation is making. In some plantations, as young 

 pine and fir, the growth is given in lineal feet ; spar- 

 wood trees are also computed in the same manner. 

 Timber-sized trees of all sorts are computed by the 

 cubic foot ; and beech, birch, alder, &c., suitable only 

 for burnwood, by the ton, load, or cord. 



Column 10 contains the money value per acre of 

 the annual growth or produce of each plantation. 

 Pit props are computed at about is. lod. per 72 

 lineal feet ; a larger size of trees, fit for crown props, 



