DEFINITIONS 



Block is a large natural subdivision of a forest, either formed by a 

 detached group of woodland, or else a section of a main forest area 

 determined by .its situation, with natural boundaries, and often with 

 a local name. It may be of any size and shape, and has nothing to 

 do with the method of treatment. 



Periodic block is a subdivision of a felling-series under the Uniform 

 method: it contains a succession of age-classes generally extending 

 over about twenty or thirty years, set apart to be regenerated during 

 the corresponding period of the same duration. The whole felling- 

 series or working-circle is divided into as many periodic blocks as 

 the rotation is divided into periods. 



Compartment is a permanent topographical subdivision of the 

 block and forms the unit of area. Its boundaries are natural, or are 

 formed by roads or lines. 



Sub -compartment is an area in which the condition of the crop, 

 its composition and age, and the soil 'and situation, are sufficiently 

 homogeneous for each such unit of the crop to be capable of being 

 described in one statement. 



Coupe is an annual felling-area under the provision of the working- 

 plan. 



Normal forest is a forest which, in addition to being fully stocked, 

 and yielding the maximum possible production of wood per acre 

 per annum up to the limit imposed by the local conditions of soil 

 and climate, is constituted of a complete and regular succession of 

 age-classes, from one year old up to the age chosen as the rotation, 

 with each age-class occupying an equal area. 



In other words, the normal growing stock results from a normal 

 succession of age-classes, with a normal increment. It is the ideal 

 state of perfection in forest organisation ; it is not absolute, but is 

 relative to a given rotation and a given silvicultural method of 

 treatment. 



Constitution of a crop refers to the existence of a regular succession 

 of age-classes in it. 



Composition of a crop refers to the species that compose it. 



Exploitability is the condition of a tree or crop that has reached 

 the age or size at which it yields the kind of produce most useful to 

 its owner, under the declared object of management. 



Possibility is the maximum quantity of material, which may, for 

 the time being, be annually removed from a forest, consistently with 

 such treatment as shall tend to bring the forest as near as possible to 

 the normal state, and with maintaining a constant yield. 



