Notes on Some Bavarian Forests 



105 



pruuitiK iK neccHMary; but, when tho 

 trees are iihtnit thirty years old, 

 science is calhMi in, as the trees will 

 have to ho j^ivoii more room to en- 

 ahlo them to thicken their trunks, 

 and. by incn'asini; Ihoir jfirth, to 

 put on wood where it will he of most 

 value to the lumherman. Thus, the 

 rcnuired lenpth of trunk having 

 been attained at an early age. it is 

 now necessary to remove tho weaker 

 trees in order to ^ive the stronger 

 ones more room to develop their 

 trunks. 



Thinning. 



The guiding principle, in thinning 



the following figures for a mixture 

 of Scotch pine, beech and spruce in 

 the Blaek Forest: — 

 Age in years. No. of trees to acre. 

 20 3,960 



40 .. 

 60 .. 

 80 .. 

 90 .. 



1.013 

 440 

 346 



2f;2 



The Forest at Isen. 



The next forest we visited was at 

 Jsen. about thirty miles east of 

 Munich. A branch railway runs 

 through this forest. 



The Forest of Isen is about 6,000 

 hectares (15,000 English acres) in 



(Courtesy Aniericin Lumherman.) 

 Planted Spruce in Saxony, 10, 20, 30 and 50 Tears Old. 



out. is to avoid the breaking of the 

 overhead canopy or the opening out 

 of the forest to such an extent as to 

 let in too many cold draughts, as 

 the trees have been reared under 

 shelter and will thrive best if the 

 shelter is maintained. 



T believe success depends, to a 

 great extent, on judicious thinning, 

 which is done every ten years or so, 

 until the trees have reached matur- 

 ity, when the final cutting will be 

 done. 



Professor Schlich in his ^lanual. 

 Vol. II. page 209. 2ud edition, gives 



area. As at Forstenrieder, so here, I 

 was much impressed both by the uni- 

 formity of the trees in size, and by 

 the regularity of their distribution. 

 The land appeared to be carrying the 

 maximum amount of timber, all of 

 which seemed to be clean and heal- 

 thy. I was also struck by the num- 

 ber of saw-mills distributed along 

 the outskirts of the forest. "With the 

 local industries on the spot, the cost 

 of haulage is reduced to a minimum : 

 and the amount of permanent local 

 employment provided must be con- 

 siderable; when a tree is cut down, 



