FOREST ADMINISTRATION. 



145 



' The maximum cubic measurement of timber yielded by 

 trees of from 170 to 200 years of age, was found to be, on 

 soil of greatest fertility 



In South Finland, 



In Middle Finland, - 



In North Finland, 



On soil of medium fertility 



In South Finland, 

 In Middle Finland, 

 In North Finland, 



135 fathoms of 100 cubic ft. 

 HI 

 66 



105 fathoms of 100 cubic ft. 

 85 , , , , 



57 



On soil of inferior fertility, such as pine moors 



In South Finland, 

 In Middle Finland, 

 In North Finland, 



75 fathoms of 100 cubic ft. 



64 



37 



A numeration and measurement of trees felled at 

 mature ages in Middle Finland gave the following 

 results : 



Other researches relating to the development more or 

 less rapid of trees in different parts of the country, have 

 given the following results : To the south of 61 30' lat. 

 pine forests do not yield timber suitable for carpentry 

 work under 60 years' growth on good lands, under 80 

 years' growth on medium lands, under from 90 to 100 



