44 THE USE BOOK. 



quantity and location of timber to be sold, requires an accurate 

 knowledge of conditions on the ground sufficient to decide upon 

 the terms of the sale. 



Wherever practicable sales should be made by area rather than 

 by specific amounts of timber. The areas selected should be 

 based mainly upon topography and should conform to the natural 

 boundaries of logging operations. Legal subdivisions are seldom 

 desirable. No small bodies of timber should be left which can 

 be taken at reasonable cost when the rest of the timber is cut but 

 which if left uncut would be isolated and without value. All 

 timber should be included in a sale which would naturally be 

 logged to a given stream, road, or mill site. If this is not possi- 

 ble, an average proportion of the most and least desirable timber 

 should be taken so that the stumpage value of the remaining 

 timber in the locality will not be reduced. 



Except in small, dead timber sales of Class A (p. 36) or in free 

 use cases the examination of any tract from which timber is sought 

 must include 



(1) Mapping. 



(2) Forest description and estimate of timber. 



(3) Kecornmendations, with reasons. 



MAPPING. 



Every report upon timber recommended for sale must contain 

 at least one map. This map must show not only the proposed 

 sale area, but also its location with reference to surrounding forest, 

 topographic features, such as ridges, streams, and roads, proposed 

 roads, camps, and mill sites, lands under patent, or claims, and 

 surveyed lines, if any. 



The map must include enough of the surrounding forest to show 

 that the timber applied for may be removed without rendering 

 the surrounding timber inaccessible and unsalable. Burns, barren 

 or open land, forest types, and the limits of merchantable timber 

 on slopes should be shown so far as they affect the desirability 

 of allowing the sale. Within the area applied for itself the 

 forest types should be shown, and the topography should be indi- 

 cated in sufficient detail to demonstrate the ease or difficulty of 

 logging the timber, and to show the natural boundaries of com- 

 partments or logging areas. In small sales one map will show all 



