398 JOURNAL OF FORESTRY 



product desired and the age which will yield the greatest income, since, 

 up to no years at least the sprouting is entirely satisfactory and ample 

 to restock the cut-over areas to full density. On account of the rapid 

 decadence of the stands at greater ages, rather than any loss of re- 

 productive vigor, it will probably be necessary to use rotations of not 

 over 90 years in the majority of Great Basin aspen stands. 



The method of brush disposal in sheep ranges promises to be the 

 most vital point in relation to aspen management, for though the cut- 

 ting may be made in the most unsystematic way the reproduction is 

 almost sure to be good ; yet if sheep are allowed full access to the 

 young aspen sprouts during the first three years they are sure to pre- 

 vent full regeneration of the stand. As yet the method of brush dis- 

 posal that will prevent the access of sheep to a suffiicent number of 

 sprouts to reproduce the stand to satisfactory density has not been 

 definitely developed, although administrative experiments are now 

 under way with brush barricades and rough open piling to accomplish 

 this end. Until this is solved, however, sheep must, to assure success- 

 ful regeneration, be excluded from aspen areas three years after cut- 

 ting, although moderate cattle grazing is permissible. 



It is accordingly evident that from a silvicultural viewpoint aspen is 

 a very desirable species, since its management is simple and reproduc- 

 tion certain, with adequate protection from sheep grazing. 



