40 



THE WESTERN HEMLOCK. 



tions as authoritatively as possible, a study of second-growth Hemlock 

 was made, the results of which are given in the following- chapter. 



VOLUME AND YIELD, SECOND-GROWTH HEMLOCK. 



The stud}" of second-growth Hemlock has so far been confined to 

 the coast region. The results obtained can also be applied with fair 

 accuracy to second growth upon the western slope of the Cascades, 

 where the rainfall is nearly as heavy as it is near the Pacific. The most 

 important localities selected as representative of coast conditions were 

 near South Bend and Willapa, in Pacific County, Wash. The former 



200, 



10 20 30 40 



100 110 120 



50 60 ?0 80 90 

 AGE -YEARS. 

 Fig. 3.— Diagram showing growth in height of second-growth Hemlock and Fir, on a basis of 



diameter breasthigh. 



contains a large tract of pure Hemlock, almost uniformly 55 years old 

 (PI. XI), which formed the basis for the study of pure stands. Near 

 Willapa were found, in addition to a pure stand of Hemlock, a typical 

 mixture of Fir and Hemlock about 75 years old, which illustrated the 

 behavior of the species when growing in mixture. A mixed stand 

 120 years old was found at Stella, Cowlitz County, on the Columbia, 

 and studies of similar stands were made elsewhere throughout the 

 State. 



Although it is not difficult to find sufficient stands of second growth 

 to show what may be expected upon logged-off lands, there is no log- 

 ging in these stands. In order, therefore, to compute yield tables, it 



