CHOICE OF SPECIES. 117 



1. Siiitahiliti/ of thr Species for the Objects of Manaijemoit. 



The varying objects of management have been indicated on 

 page 1. Whatever the.y may be in any special case, the 

 species must be selected so as to do them full justice. 



If the object is to grow produce of a definite description, 

 the species must be capable of yielding it ; it would be useless 

 to grow yew for hop poles, or poplar for naval construction. 

 Where the objects of management are governed, or influenced, 

 by existing forest rights demanding timber or firewood of a 

 particular species, that tree must be grown. If, on the other 

 hand, third persons are entitled to trees of certain species, 

 should they happen to appear on the area, the owner would 

 not voluntarily cultivate them. 



Where the object is to j)roduce the greatest possible quantity 

 of material per unit of area, that species must be selected 

 which produces the highest average annual increment. 



In gauging the financial desirability of a species, the 

 quantity and quality of the produce, as well as the expense 

 of rearing it, must be taken into account. In some cases 

 only certain species are saleable, while others are without 

 value. Again, some species produce a much higher percentage 

 of timber as compared with firewood, than others. 



Species with a thin crown are indifi'erently adapted for wind 

 breaks, whereas the}' may be specially suited for nurses over 

 a tender crop, or as standards over coppice. 



The above instances will suftice to show that the number of 

 species which may be desirable in any given case is narrowed 

 down by the objects of management. 



2. Adaptability oj tlic Sjiecies to the desired Sylvicultaral 

 System. 



All species of trees can be treated as high forest, but only 

 a certain number as coppice woods. The conifers of temperate 

 Europe either do not coppice at all, or very indifi'erently; 

 even some of the broad leaved species do not yield satisfactory 



