A :\I E R I C A X .S Y L V I C U L T U R E 



C. Advantages: 



I. Xo expense required for regeneration (unless weeds, leaves 

 or moss are removed). 



II. Advance growth is readily saved, where the logs are removed 

 through the adjoining woods. 



III. A road system touching the lower edge of the strips is 

 sufficient. 



IV. Soil is never laid bare. 



V. Little damage from windfall. 



D. Disadvantages: 



I. Scattering operations. 



II. Type is not applicable to light demanders. 



III. Hypermature trees must be left in the woods until the 

 strips, after many years, may approach them. 



IV. Points of attack from which cutting may proceed are apt 

 to be lacking, unless the forester, helped by th.^ configuration of 

 the ground, is able to maintain a large number of narrow cutting 

 series. 



Paragraph LV. The advance growth ^roup type 

 of natural seed regeneration. 



A. In nature, advance growtli usually appears in small 

 bunches or in groups, for the reason that there is always a chance 

 for many seedlings to sprout and develop on a spot where light, 

 humidity and soil allow a single individual to make a start alone. 

 In the primeval woods, groups of adyance growth formed by shade 

 bearing species are almost invariably at hand. Even light de- 

 manders may form small groups of advance growtli in spite of a 

 superstructure overhead, provided that the soil is strong enough to 

 support them. 



Such groups, freed from tlie trees superstructing them, will 

 develop one or a number of saplings which in turn and in course 

 of time may yield one or a few poles promising to grow into trees 

 of a loggable size. 



Very frequently the groups are formed not vmder the leaf 

 canopy of the parent species, but imderneath another species acting- 

 as a step-parent. 



Indeed, step-parents of a rather selfish kind, inimical to the 

 children, are frequently encountered in tree life, handicapping and 

 killing the young progeny thirsting at their feet for light and rain. 



The endurance of advance growth living under adverse condi- 

 138 



