252 COLLECTION OF STATISTICS. 



treatment. All points, which have influenced the quantity and 

 quality of the results, must be ascertained, to enable the 

 forester to judge of the merits of the treatment hitherto 

 followed and the advisability or otherwise of any changes 

 in it. 



a. Metliod of Treatment, or Si/lvicultural System. 



The different methods of treatment have been described in 

 Volume II., page 89. In this place, the forester must ascertain 

 the system, under which the wood has actually been managed 

 in the past. 



b. tSpecies. 



Pure woods are indicated by giving the species. In the case 

 of mixed woods, the degree of mixture must also be given ; 

 this can be done, either by adjectives, such as " some," "a 

 few," or, preferably, by decimals, placing the whole as 1. 

 These decimals should have reference to the area occupied by 

 each species. 



Example. — The following description — 



Beech = '5 

 Oak = -3 

 Ash = -2 

 Maple = a few, 



would mean, that one-half of the area is occupied by beech, 

 •3 by oak, and "2 by ash, with a few maples. 



In the case of very valuable trees, such as old oaks, or teak 

 trees in Burma, it may be desirable to give their actual 

 number. The manner of admixture is expressed as " in 

 single trees, ■■ "in groups," "in strips," or "irregularly 

 distributed." 



It is also necessary to state, whether the mixture is 

 permanent or temporary, whether it is of special sylvicultural 

 or financial importance, such as a shelter wood (or nurses) 

 over another tender species, a soil protection wood, standards 

 of valuable species, etc. 



