1917] FORESTEY. 243 



reading only on bright days about noon; all these make for inaccuracy and 

 emphasize the difficulty, if not impossibility, of determining the relation of 

 forest trees to light by a study in the forests." 



Since results of forest measurements indicated that the relation of tree 

 growth to light as an influencing factor can be determined only by controlled 

 greenhouses and nursery trials, the author constructed a series of frames, some 

 of which were covered with white cheesecloth and others with similar cloth 

 dyed black. With such an equipment it was found that a continuous shade of 

 any desired percentage of total light can be obtained within certain limits 

 during an entire experimental period. A preliminary experiment with white 

 pine, balsam fir, and hemlock seedlings was conducted under such shade. It 

 was found that when the light intensity was so far reduced as to register 

 0.0266 no starch whatever could be detected in the white pine leaves. Hemlock 

 reached its minimum at about 0.005. The trials are being continued, using 

 several more varieties. Observations made of white pine seedlings growing 

 under large cheesecloth shade with the light reduced to varying degrees of 

 intensity indicate that the chief factor of the slow development in some cases 

 was not lack of light but some other factor, possibly root competition for water 

 and food in the soil. 



The author is of the opinion that "tolerance" should be stricken from the 

 vocabulary of forestry students unless it can be made to mean more than light 

 relationship, since it expresses not a light relationship but the total relation- 

 ship of a tree to all factors of the habitat. 



The Keene forest. — A preliminary report, J. W. Toumey and R. 0. Hawley 

 (Yale Forest School Bui. ^ (1916), pp. 25, pis. 4)- — This comprises a descriptive 

 account of the Keene forest of the Yale School of Forestry, located near 

 Keene. N. H., including suggestions relative to work accomplished and to a 

 general policy for the treatment of each type of wood in the forest. 



Forests of Porto Rico; past, present, and future, and their physical and 

 economic environment, L. S. Muephy (U. S. Dcpt. Agr. Bui. 354 {1916), pp. 

 99, pis. 13, figs. 7). — This bulletin comprises a report of a survey of forest 

 problems in Porto Rico conducted by the Forest Service in cooperation with 

 the Government of Porto Rico. It also revises and brings up to date two 

 previous bulletins of the Forest Service dealing with the forests and forest 

 conditions of Porto Rico (E. S. R., 11, p. 853; 16, p. 878). A general account 

 is given of the physical and economic features of Porto Rico, together with a 

 discussion of the condition and distribution of forests, forest formations, for- 

 est influences, commercial aspects, forest industries, products, and problems, 

 and suggestions relative to an insular forest policy. 



Appended to the bulletin is a descriptive account of Trees of Porto Rico, 

 by W. D. Brush, L. S. Murphy, and C. D. Mell. Each species is described with 

 reference to its nomenclature, distinguishing characteristics, wood structure, 

 and economic iises. A bibliography of consulted literature is also appended. 



The productive capacity of the Douglas fir lands, western Oregon and 

 Washington, T. T. Mungeb (Univ. Cal. Jour. Agr., 4 (1916), No. 3, pp. 92, 93, 

 fig. 1). — A discussion of the productive capacity of Douglas fir lands, including 

 some data showing the current annual growth of Douglas fir forests at various 

 ages on three separate site qualities. The discussion is based upon studies 

 conducted under the direction of the Forest Service of the U. S. Department 

 of Agriculture and partially noted (E, S. R., 25, p. 141). 



Hovea tapping results. Experiment Station, Peradeniya, 1915, T. Petch 

 (Dept. Agr. Ceylon Bui. 25 (1916), pp. 14)- — A progress report on tapping ex- 

 periments started in 1912 (E. S. R., 33, p. 542). 



Moreh oak, a new name for Quercus morehus, W. H. Lamb (Jour. Wash. 

 Acad. ScL, 6 (1916), No. 19, pp. 657, 658). — The name Moreh oak is here pro- 



