228 FORESTRY [Bot. Absts!, Vol. VI, 



British plantations show that while the former "when grown in dense plantations surpasses 

 all other species in yield of timber," the latter "is healthy enough but it is of no commercial 

 value for planting." — Differences in microscopical leaf structure in the various species are 

 indicated with the aid of typical cross section drawings. As final proof of the specific rank of 

 Pseudotsuga glauca, results of distillation experiments with leaves of this tree and of P. 

 taxifolia from British plantations are given. Oil from the Oregon species contains appreci- 

 able amounts of the fragrant geraniol, chief constituent of Indian palmarosa oil and present 

 in citronella oil, otto of roses, lemon oil, etc., hitherto reported as a constituent of the oil of 

 some species of Callitris, or "Cypress Pines" of Australia, but not from other conifers. 

 This oil, which is said to give the peculiarly pleasant odor to the leaves of Oregon Douglas 

 fir, is not found in the Colorado variety. Oil of the latter species contains a large percentage 

 of pinene, which constituent is not found in the Oregon species. An interesting analogy is 

 pointed out in the distribution, size of cones, and difference in oil content of the varieties of 

 Douglas fir and Western Yellow Pine. — Woodbridge Metcalf. 



1545. Judd, C. S. The Australian red cedar. Hawaiian Forester and Agric. 17:57-59. 

 1 pi. 1920. — An account of the successful introduction of Cedrela Australis in Hawaii, with a 

 general description of its appearance, silvical characters, and economic uses. Because of 

 its ease of propagation, rapid growth, and valuable wood products, it gives great promise as 

 one of the future timber-producing trees of the territory. The plate shows an Australian 

 red cedar, measuring 30 feet in height, 4^ inches d.b.h., two years and nine months from 

 planting. — Stanley Coulter. 



1546. Judd, C. S. Division of Forestry. Hawaiian Forester and Agric. 16: 6-9. 1919. — 

 In addition to the routine report for December, 1918, the establishment and location of six 

 new forest reserves, aggregating 41,355 acres is given. This gives a present total area of forest 

 reserves in the Territory of 814,926 acres, of which 554,842 acres is government land. — Stanley 

 Coulter. 



1547. Judd, C. S. Eucalyptus plantation. Hawaiian Forester and Agric. 16:20-24. 

 1919. — "The object of the plantation was to secure data as to the habit, form, rate of growth, 

 and relative value under local conditions of species of Eucalyptus supposed to be of economic 

 importance that are as yet but little known in Hawaii." The conditions were not favorable 

 for best growth and development and the test was an endurance rather than a growth test. 

 Eighteen species were planted, measurements being made at five years growth, both of diame- 

 ter and height. Of the species used, the Black butt (E. pilularis) made the best showing, 

 producing an equivalent of 4^ cords per acre in five years. Other species making a fair show- 

 ing were E. gomphocephala, E. muelleriana, and E. Sieberiana, which produced an equiva- 

 lent yield of 3.42 to 3.62 cords per acre for five years. Measurements are to be continued at five 

 year intervals. — Stanley Coulter. 



1548. Judd, C. S. Forestry in Hawaii. Hawaiian Forester and Agric. 16: 271-299. 

 1919. — A series of 3 lectures delivered at the short course for plantation men at the College 

 of Hawaii, Honolulu. The subjects treated are "The Beneficial Effects of Forests," "The 

 Native Hawaiian Forests," and "Methods of Forest Protection." Admirably adapted to 

 Hawaiian needs. — Stanley Coulter. 



1549. Judd, C. S. The koa tree. Hawaiian Forester and Agric. 17: 30-35. PI. 3. 1920. 

 — The genus Acacia, to which the Koa belongs, is represented in the Hawaiian Islands by three 

 species, one of which, A. Koa, has two varieties. Acacia Koa is the familiar form and is 

 found on all of the islands. The other species and varieties are less common and of more 

 or less restricted distribution. General descriptions of the forms are given and the possible 

 origin and economic uses are discussed. At one time the Hawaiians used Koa wood for 

 canoes, surf boards, paddles, and spears, as well as for house timber. Very few Koa canoes 

 are now made since the large trees suitable for their construction have almost entirely disap- 

 peared. The chief present value of the Koa tree is not as a lumber producer, but as a tree 

 for a cover forest on mountain slopes. It is also a suitable tree for reforesting denuded areas 

 where good drainage and favorable soil conditions obtain. — Stanley Coulter. 



