34 



The above tables show the volume of trees expressed in cubic 

 feet or in cords. Lumber trees, however, are usually measured 

 in board feet, the board foot being a board one foot square and 

 an inch thick. Since few of the trees measured were large 

 enough to be scaled by the board foot, no table was constructed 

 for Hawaii to show the lumber contents of various sized trees. 



YIELD. 



Because of the insufficiency of old groves it has been found 

 impossible, as already stated, to construct tables showing the 

 yield of wood from various plantations. Seven groves, however, 

 varying in age from 5 to 20 years, were found growing under 

 conditions regular enough to allow the measurement of sample 

 plots, the results of which are summarized in Table IV. 



TABLE IV. 



YIELD OF BLUE GUM PLANTATIONS. 



Age No. trees Volume Volume 



Years, per acre. per acre, per acre. KEMAKKS. 



(cu. ft.) (cords) 



5 244 1363 15.1 Makawao, Maui; Elev. 4500 



ft. Spacing irregular about 

 12x18. Many trees wind- 

 thrown. 



5 180 1568 17.4 Makawao, Maui; Elev. 4200 



ft. Spacing 12x15. 



6 236 1853 20.6 Makawao, Maui; Elev. 4200 



ft. Spacing 12x15. 



7 176 1861 20.7 Makawao, Maui; Elev. 2400 



ft. Spacing 15x15. 



8 570 2039 22.6 Kaluanui, Maui; Elev. 1500 



ft. Spacing 9x9. 

 11 216 3725 41.4 Kailiili, Maui; Elevation 2400 



Spacing 10x15. 

 20 382 5292 58.8 Paauhau, Hawaii; Elev. 1600 



ft. Spacing 10x10. 



None of the groves in which the measurements were made 

 for the above table were grown under ideal conditions or under 

 proper spacing, and the yield of properly-regulated groves should 

 have made a much more favorable showing. But imperfect as 

 the above table is, it shows the disadvantage in cutting young 

 trees. Thus while the yield of the seven-year-old grove was 20.7 

 cords to the acre, and of the eight-year-old grove 22.6 cords to 



