172 



story of trees below commercial size, 

 it was possible sometimes to remove the 

 large old trees and allow the younger 

 element to continue growth with little 

 loss or damage until it reached a size 

 that could be harvested. However, in- 

 jury to the reserve stand must be 

 avoided. Studies at Wind River showed 

 that top, bole, or base injury from log- 

 ging or sunscald resulted in serious de- 

 cay entrance within 10 years with non- 

 resinous species, such as hemlock and 

 the balsam firs. 



These method-of -cutting studies are 

 being continued on a larger scale in 

 both young- and old-growth stands. 

 The new work will include tests of 

 measures to reduce loss from windfall, 

 insects, and disease } to retard brush in- 

 vasion, speed up restocking, and con- 

 trol species composition. With the in- 

 crease in the demand for wood, studies 

 are developing in the more complete 

 utilization of wood in logging opera- 

 tions and in the salvage of waste for 

 pulp and other special uses. 



One of the most highly valued fea- 

 tures of the experimental forest is the 

 arboretum. It is the oldest proving 

 ground in the region for the conifers 

 of the world and now has growing 



Yearbook of Agriculture 1949 



groups of more than 1 35 species prac- 

 tically all that will survive in that cli- 

 mate. There students are able to study 

 species growing side by side and collect 

 seed and specimens. 



LEO A. ISAAC obtained his forestry 

 training at the University of Minne- 

 sota. He has spent 4 years in adminis- 

 trative work on the national forests and 

 24 years in forest research in the Pacific 

 Northwest. His chief interest has been 

 in silvicultural research, and he is the 

 author of several publications in that 

 field. At present he is in charge of 

 silvicultural research at the Pacific 

 Northwest Forest and Range Experi- 

 ment Station in Portland, Oreg. 



WILLIAM E. BULLARD was graduated 

 from the University of California in 

 1935 with a degree in forestry. Since 

 then his chief interest has been the cor- 

 relation of watershed management 

 with forest management. He spent 6 

 years in silvicultural and flood-control 

 research in California and Washing- 

 ton, D. C., 4 war years on the Guayule 

 Rubber Project in California, and 2 

 years in forest-management work as 

 officer in charge of the Wind River 

 Experimental Forest. 



Retarded <jf owtK 

 after fire 



Accelerated growth 

 alter 



fire and thinning influence the growth of trees. 



