the theory and practice of working plans 147 



2. Foundation 



(a) Growing Stock (Estimates). — The estimates should be 

 in form of a table by species and classes of timber, either separate 

 stand and stock tables or as part of the general stand table. The 

 details of this estimate table depend on the intensity of the entire 

 plan. It will usually sufhce to give the totals by compartments 

 (if any) and blocks, or else by survey units such as sections, or 

 even townships. Separate estimates may be given for each 

 forest type. The estimate for the entire working unit must 

 always be given. It must also be stated to what minimum 

 diameter trees were estimated, and if available, what average 

 deduction must be made for defect. Estimates in greater 

 detail, e.g., section sheets showing the stand on each " forty," 

 should be reserved for the appendix or for the files. Volume 

 tables should be placed in the appendix. 



(b) Increment. — The increment, either current or mean 

 annual, or else both, is given, and is expressed either in incre- 

 ment per acre or as a per cent or both. Growth and peld 

 tables on which the calculation of increment may be based 

 should be included in the appendix. 



(c) Distribution of the Age Classes. — If the stand is even- 

 aged or approximately so, a table of age-class distribution, like 

 the example already given, should be included. Not only does 

 such a table show at a glance the relation of young, mature, 

 and overmature timber, but, in the revisions of the working 

 plan, it shows by means of graphs or blocks what progress has 

 been made toward the attainment of normality in this direction. 



(d) General Stand Table. — A table approximating, as far 

 as possible, the example in Chapter I, Section 2, should be 

 included as a convenient tabular summary of areas, volumes, 

 and conditions of timber. 



(e) Maps can be elaborated to almost any extent according 

 to the kind and importance of the data to be shown thereon. 

 The following are the most important: 



(i) A topographic map showing topography in contours, 



