IRAN'SACriONS OF KOVAL SCOTIISH ARBORICULTURAL SOCIETV, 



per acre per aniuim. If this standard is not being reached, there 

 is a fairly strong presumption either that the management is 

 defective, the wrong species is being grown, or the soil and 

 elevation are such that profitable forestry is doubtful or 

 impossible on the particular area in question. Many middle- 

 aged and nearly mature crops may fall considerably below 

 such a standard, and the problem set before the forester in these 

 cases is — how and when to realise such crops to the best 

 advantage, so as to replace them with fresh crops of the most 

 suitable species established under proper conditions. 



The results shown in the foregoing table are merely averages 

 for each area. To give the details for each stem would 

 have occupied too much space. Part of the object of the 

 investigation was to ascertain in what months growth was 

 actually made, and to endeavour to trace what connection, if 

 any, existed between weather conditions, such as rainfall, and 

 timber increment. The following are the results obtained : — 



Such differences as appear tend to show that timber increment 

 on the main stem commences two to three weeks earlier on a 

 good soil than on poor soil ; and that on peat little or no 

 increment is made until the ground is fairly dry. This is 



