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capacity during continuous harvesting which is the goal of true 
forestry and is technically known as ''sustained yield." 
According to official estimate, in the present instance the com- 
pany will cut over its half of the working center during the life 
of its contract, and at. the end of thirty-one years the balance 
of the center will be offered for sale. Barring accident, this 
second half will likewise require thirty years for a complete 
harvest, at the end of which time the first half of the center will 
again be ready for the axe. The entire area is thus put upon 
a sixty-year rotation on a basis of continuous management. 
C. J. K. 
CHAULMOOGRA OIL PLANTATION. 
By C. S. Judd^ Superintendent of Forestry. 
For the purpose of supplying chaulmoogra oil for the treat- 
ment of leprosy in the Territory of Hawaii, the Board of Agri- 
culture and Forestry has recently established a plantation of 
three species of chaulmoogra oil producing trees on government 
land in the Waiahole Forest Reserve in the District of Koolau- 
poko, Oahu. 
The planting out of the trees, with a spacing of 20 by 20 feet 
apart, was begun in December, 1921, and up to the end of March, 
1922, 2,360 trees had been set out on an area of 22 acres. There 
are still on hand 640 trees which will cover an additional area 
of 6 acres, making the whole plantation 28 acres in area with a 
total stand -of 3,000 trees. 
Most of the land where these trees were planted was first 
plowed and harrowed to insure rapid growth and cultivation 
will be kept up so as to favor the early production of the 
valuable seed which should appear on the trees in about eight 
years. 
The seed for these trees was secured by Mr. J. F. Rock and 
one-half was germinated at the Government Nursery and the 
other half at the nursery of the Hawaiian Sugar Planters'As- 
sociation. 
The chaulmoogra tree of Siam (Hydnocarpiis an th elmin tic us) 
is most largely represented in this plantation with 2,070 seedlings. 
The Kalaw tree (Taraktogenos Kurzii) of upper Burma comes 
next with 850 trees. This is the principal tree producing the oil 
although the oil of the other two species seems to give equally 
good results. Mr. Rock secured the seed of this chaulmoogra 
from the region along the upper Chindwin River in Burma. The 
third species, also called Kalaw, (Hydnocarpus castanea) is rep- 
resented by 80 trees, the seed for which was secured in the Mar- 
taban Hills near Moulmein in Lower Burma. 
