RI'GUtATlON IN YIU,U)W TINE; 167 



accompanied for some time by a large amount of unavoidable loss 

 in old and defective stuff, and it seems advisable to keep the cut 

 correspondingly a little below rather than above that worked out 

 by the above calculations. 



o. Whether, in this plan of Regulation, the figure of twenty- 

 five million per year or thirty-two million is used, is not of very 

 great consequence. In any case the cut should follow the plan 

 faithfully, and if it does, there is little danger of serious overcut. 

 But this plan must never continue longer than forty years without 

 some revision, a new inventory, a new study of the situation. 



p. When once the larger part of this property is accessible by 

 roads and railways, so that the selection method can- give way to 

 clear cutting, regulation may well divide this large forest into 

 several working sections, and certainly cut out the timberline country 

 as a permanent selection forest. Then also, regulation of accessible 

 portions should change from any one of the above forms to an Area 

 Allotment based on the forty acre tract subdivision of the forest. 

 With this, there must also come development of well planned cutting 

 series, preferably of a single lot in level country and on easy slopes, 

 but of lots to fit topography in all steeper and more broken country. 

 Injury from wind and snow in Lodge Pole as well as great danger 

 from fire will recommend these independent stands. 



5. Regulation in Western Yellow Pine. 



The property here considered had about the following condi- 

 tions in 1912. 



a. Area : Nearly one million acres. 



Topography; plateau and easy slopes prevail, average altitude 

 4500. 



Site: climate, moderate; rainfall about 30". Snow deep, over 

 three feet ; 100 days sleighing; summers warm and dry. Soil, mostly 

 deep, pumice sands, quite fertile. 



b. Timber: largely in even age (all-old) stands; much over- 

 ripe stuff "spike top." Only about 20,000 acres of young stands on 

 lands, cut over in last forty years. 



Growth : the TOO year tree is normally about 18" d. b. h. and 

 100 feet in height for dominant stuff. Fully stocked mature stands: 



