COMPLETE YIELD TABLES FOR BRITISH WOODLANDS 

 AND THE FINANCE OF BRITISH FORESTRY 



CHAPTEE I 



AN INTRODUCTION 



IT is necessary that the following yield tables be 

 prefaced by a few notes of an explanatory nature. 



General Note. The yields stated in these tables can 

 only be attained if the crops escape any special damage 

 due to insects, fungi, fire, or storm. And as regards 

 the volumes of the final crops, these could generally 

 be increased if the amount removed as thinnings 

 were restricted ; but such a course would seldom be 

 advisable. 



Quality of Soil and Situation. The adaptability 

 of any particular area for the successful growth of 

 timber is indicated by describing the soil and situation, 

 which must be considered the one along with the other, 

 and which includes, inter alia, a consideration of the 

 aspect, altitude, rainfall, and relative humidity of the air, 



as being referable to one of four qualities Quality I. 

 being the best, and Quality IV. the worst ; Quality II. 

 land represents good average land in fairly sheltered 

 districts, and is capable of growing excellent timber. 



It is, however, necessary to remember that the 

 same area is not necessarily representative of the 

 same quality for different kinds of trees. For instance, 

 an area may be Quality I. for Scots Pine, and yet only 

 Quality III. for Ash ; or Quality I. for Corsican Pine, 

 and only Quality III. for Sitka Spruce or Thuya plicata. 



The yields, as stated, where the soil and situation 

 are Quality I., must not be taken as representing the 

 very best yields which are occasionally obtained from 

 small plantations in most favoured localities, but they 

 represent an average such as can be obtained over 

 considerable areas of the best forest land. 



