1917] FORESTRY. 447 



and unsettled regions. The subject matter is discussed under the general head- 

 ings of equipment, construction work, general field work, live stock, and mis- 

 cellaneous. Numerous tables and miscellaneous information, together with a 

 glossary of local and technical terms used of value to the forester, are appended. 



Ecological investigations upon the germination and early growth of forest 

 trees, R. H. Boebker {Thesis, Univ. Nebr., 1916, pp. 90, pis. 5, figs. 23; Univ. 

 [Nebr.] Studies, 16 (1916), No. 1-2, pp. 1-89, pis. 5, figs. 23).— A doctorate 

 thesis to the faculty of the graduate college of the University of Nebraska, and 

 constituting an inquiry into the effect of the more important habitat and seed 

 factors upon the germination and early development of certain American forest 

 trees for the purpose of obtaining data that may be used in the silvicultural 

 management of these species. The author's observations were made on control 

 cultures in the greenhouse. The results are presented in tabular form and 

 fully discussed. A bibliography is appended. 



The significance of certain variations in the anatomical structure of wood, 

 R. P. Prichard and I. W. Bailey (Forestry Quart., 14 (1916), No. 4, pp. 662- 

 670, fig. 1 ) . — This paper summarizes the results of one of a series of investiga- 

 tions that have been undertaken at the Bussey Institution in the study of plant 

 tissues and cells, their comparative structure, relative conservatism, and be- 

 havior under the influences of various modifying factors. The present investiga- 

 tion deals with the variation in size of the principal woody elements (fibers 

 and vessel segments) in various parts of the stem of the common shagbark 

 hickory (Gary a ovata). 



Belationship of the Douglas fir to lime in soil, Someeville (Quart. Jour. 

 Forestry, 11 (1917), No. 1, pp. 1-6). — An inspection of some Douglas fir planta- 

 tions occurring in chalk lands led the author to conclude that, contrary to a 

 rather common opinion, Douglas fir is more or less tolerant of lime, and may 

 be recommended for planting even where solid chalk occurs within 2 ft. of the 

 surface and where abundant lumps of chalk are met with even at a less depth. 



The girth increment of Hevea brasiliensis, T. Petch (Ann. Roy. Bat. Gard. 

 Peradeniya, 6 (1916), No. 2, pp. 77-86, pis. 5). — In January, 1912, regular girth 

 measurements on H. brasiliensis were begun at Peradeniya as part of an in- 

 vestigation into certain phases of the physiology of the tree. Tabular data are 

 given shovsing the girth increases for 16 trees up to March, 1914, together with 

 growth curves of untapped and tapped trees. 



Sugar pine, L. T. Labsen and T. D. Woodbury (17. S. Dept. Agr. Bui. 426 

 (1916), pp. 40, pis. 10). — An account of the sugar pine (Pinu^ lambertiana) 

 with reference to its importance, geographical and commercial range, botanical 

 characteristics, growth, silvical requirements, reproduction, and forest t3rpes. 

 Consideration is also given to the mechanical and physical properties of the 

 wood, methods of logging and milling, values and grades of lumber, markets, 

 uses, stumpage prices, growth and yield, and management, including the man- 

 agement of private timber lands. Appended to the bulletin are a volume table, 

 based upon measurements of 910 felled trees taken by the Forest Service in 

 California; a key for the identification of sugar pine, western white pine, and 

 white pine woods ; and a classification of sugar-pine lumber into grades. 



The forests of Worcester County, H. O. Cook (Boston: State, 1917, pp. 88, 

 pis. 7, figs. S). — This comprises the results of a forest survey of the 59 towns 

 in Worcester County, Mass., together with a study of their lumber industry. 

 The data given for each town include the acreage in various forest types and 

 age classes, the acreage in nonforest tjrpes, and the wood-using industries. 



Improving the woodlot, J. B. Berey (Ga. State Col. Agr. Circ. SI (1916), 

 pp. 8, figs. 2). — A popular treatise on woodlot management. 



