SYLVICULTURE 



VI. Stopping all logging operations during seed years of the 

 weed-tree species. 



VII. Fire. 



Any of these remedies will answer on a regeneration area pro- 

 vided that it inflicts greater damage on the weed trees than on 

 the aristocrats, and that the success is fully commensurate to the 

 expense. 



A careful choice of the type of regeneration (cleared, shelter- 

 wood, and advance growth types in compartments, strips, groups 

 or patches) is, however, the best weapon in the hands of the forester 

 against mobbish usurpation. 



The time may come when the forester will avail himself of 

 plagues of fungi, vertebrates and insects in the struggle against 

 weed trees. 



Obviously, where the logger, followed by fires, removes every 

 vestige of the aristocracy and every chance for its reproduction on 

 deteriorated soil, there the sylvan battle is lost for the forester 

 beiore it is begun. 



Frequently in nature's economy and ecology a crop of weed 

 trees (Birches, Cottonwoods) intervenes between two generations of 

 aristocrats. This " rotation of crops " resembles that of agricul- 

 ture, and is hard to explain. Attempted explanations are: Exhaus- 

 tion of soil in mineral matter required by the previous species. 

 Presence of baccilli, bacteria, fungi, insects, etc., inimical to the 

 previous species. 



Paragraph LVIII. Pedagogy of the high forest. 



Forest pedagogy or forest tendance, the second part of the 

 sylviculturists' activity, is of little importance in America at the 

 present time since there are no wood crops at hand which might 

 be profitably tended. Forest protection, usually considered a branch 

 of forestry, is merely a oranch of forest tendance. 



The following operations are here treated under the heading 

 forest tendance: 



A. Cleaning 



B Weedinp- f ^directly remunerative acts or investments. 



C. Improvement cuttings ) Directly remunerative acts yielding 



D. Thinning f a surplus revenue. 

 F. Underplanting ) 



E Pruning f I n di rec tly remunerative acts or investments. 



The definitions of the terms " cleaning," " weeding," "improve- 

 ment cutting " and " thinning " are so indistinct that it is often 



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