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, : - 135 fathoms of 100 cubic ft. 
In Middle Finland, - 111 4 es 
In North Finland, - : 66 Cs, ” 
On soil of medium fertility— 
In South Finland, - - 105 fathoms of 100 cubic ft, 
In Middle Finland, - - 85 ” ” 
In North Finland, - - 7 fe ” 
On soil of inferior fertility, such as pine moors— 
In South Finland, - 75 fathoms of 100 cubic ft. 
In Middle Finland, - 64 3 ” 
In North Finland, - 37 % ” 
A numeration and measurement of trees felled at 
mature ages in Middle Finland gave the following 
results :— 
Number of Trees on Tunnland, 
Hewn Timber, | Sawn Timber, 
Ages, Average. 9-12-2 inch ‘Average 12°2 Total. 
diameter at |inches diameter 
breast height |at breast height} +: 
without bark. | without bark. 
160-170 166 124 43 167 
180-190 183 126 53 179 
190-200 196 108 75 183 
210-220 218 101 90 191 
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 
L 
