FOEESTBY. 739 



A table is given showing the variation in this relation with age and quality 

 site for dominant trees of Pinus tceda. 



The constniction of a set of taper curves, W. B. Barrows (Proc. Soc. Amer. 

 Foresters, 10 {1915), No. 1, pp. S2-40, figs. 5).— A discussion of methods in 

 vogue in preparing tabulations and curves showing the taper of trees for a 

 given species. 



Reading and replotting curves by the strip method, W. B. Baebows {Proc. 

 Soc. Amer. Foresters, 10 {1915), No. 1, pp. 65-67, figs. 9).— A method of reading 

 and replotting curves representing graphically values used in forest measure- 

 ments is here described. 



The clinometer on fire lookouts, D. Bruce {Proc. Soc. Amer. Foresters, 10 

 {1915), No. 2, pp. 201-206, figs. 4).— The application of the clinometer to the 

 location of forest fires from lookout points is described. 



The invasion of a planted prairie grove, R, J. Pool {Proc. Soc. Amer. 

 Foresters, 10 {1915), No. 1, pp. 1-8, pi. 1).—A discussion of changes in the flora 

 in the prairie region of Nebraska as brought about by the establishment of 

 forest plantations of considerable size. 



Investigation into the retarding effect of lime on the growth of conifers, 

 A. D. HoPKiNSON and H. D. Elkington {Agr. Students' Gaz., n. ser., 17 {1915), 

 No. 4, PP- 176-178). — ^An investigation was started at the Royal Agricultural 

 College in 1914 to ascertain the effect of varying quantities of calcium carbonate 

 on the growth and development of Douglas fir {Pseudotsuga douglasii). 



The data thus far secured indicate that Douglas fir grows well in sandy soils 

 with small amounts of calcium carbonate. Increasing quantities of calcium 

 carbonate up to 8 per cent have a distinct retarding effect on its growth. Above 

 8 per cent of calcium carbonate some counteracting factor, whose influence has 

 not yet been established, dominates this retarding effect of the lime. 



A study of Douglas fir seed, C. P. Willis and J. V. Hofmann {Proc. Soc. 

 Amer. Foresters, 10 {1915), No. 2, pp. 141-164). — This comprises a progress 

 report on a study of Douglas fir seed which is being carried out at the Wind 

 River Experiment Station, Carson, Wash., with special reference to securing the 

 best type of seed for artificial reforestation, and to determine what class of 

 seed trees are satisfactory for the natural restocking of timber-sale areas. As 

 a result of the data secured in 1913 and in 1914 from planting tests of seed of 

 varying sizes and secured from various sources, a number of suggestions and 

 rules are given for application to cone collecting and in the selection of seed 

 trees for reforesting cut-over areas. 



Douglas fir and fire, C. S. Judd {Proc. Soc. Amer. Foresters, 10 {1915), No. 

 2, pp. 186-191). — This paper shows the influence of forest fires in creating 

 favorable conditions for the development of Douglas fir stands. The most 

 favorable effect of forest fires in this respect is the burning off of the humus 

 so that the mineral soil is exposed. In this soil Douglas fir, with its vigorous 

 reproductive capacity, regenerates itself to the almost complete exclusion of 

 other competitive and dominating species. 



The management of Engelmann spruce-alpine fir stands, J. W. Spenceb 

 {Proc. Soc. Amer. Foresters, 10 {1915), No. 2, pp. 192-198). — An account of the 

 plan of management of mixed stands of Engelmann spruce and alpine fir at the 

 Battlement National Forest, Colorado. 



Monterey pine, L. T. Larsen {Proc. Soc. Amer. Foresters, 10 {1915), No. 1, 

 pp. 68-74). — An account of Monterey pine with reference to its range and 

 occurrence ; climatic, soil, and moisture requirements ; associated species ; habit 

 of growth ; tolerance ; rate of growth and longevity ; yield ; susceptibility to 

 injury ; reproduction ; and management. 

 12146°— No. 8—15 4 



