FORESTRY. 453 



the merits of different trees in connnon nse are considei'ed and lists given of those 

 which have been found l)y experience to be best titted for street planting. iSugges- 

 tions are also made on planting, pruning, protecting, and caring for wounds, and 

 other operations connected with the general care of sti-eet trees. The author recom- 

 mends for general street planting red, pin, scarlet, black, shingle, and willow oak; 

 Oriental and American sycamore; Ailanthus, and Norway maple; and suggests that 

 the gingko, American ash, hackberry, sweet gum, and Kentucky coffee tree merit 

 further trial. 



The alders, J. Houba {Bid. Soc.Cent. Forest. Bdg., 9 {1902), No. 6,2^p. 353-359).— 

 Descriptions are given of a number of species of alder, and their value in forest plan- 

 tations, character of the timber produced, adaptibility, etc., are discussed. The 

 characteristics of the white alder are described at considerable length. The other 

 species are said to be quite similar in their characteristics and uses. 



The relationship of some American and Old World birches, M. L. Ferxald 

 {Amer. Jour. ScL, 4- ser., U {1902), No. 81, pp. 167-194, pis. 2). — Attention is called to 

 the possible relationship of some of the species of birches found in the high latitudes 

 of America and Asia. 



The slippery elm, J. T. Rothrock {Fared Leaves, 8 {1902), No. 9, p. 136, j^U. 2). — 

 A descriinion of the slippery or red elm ( Ulmus fulva) . Its characteristics, botanical 

 characters, and physical properties. 



Treatment of second-growth white pine, W. I. Hutchixson {ForeMrij (tnd 

 Irrlg., 8 {1902), No. 9, pp. 370-373, figs. 4)- — Detailed directions are given for the 

 management of second-growth white pine. It is said that the thinnings should be 

 carried on sparingly until the end of the principal height-growing period, which 

 occurs when the trees are about 40 years old. After this the thinnings should be 

 increased, in order to remove the inferior and diseased specimens. If the wood 

 lot does not consist of a pure stand of white pine the thinnings should be mostly of 

 the hard woods. Where natural pruning is not sufficiently active it will be found 

 advisable to assist in removing the lower and dead branches. 



The Jersey scrub pine, J. T. Rothrock {Forest Lewes, 8 {1902), No. 10, p. 152, 

 pis. 3). — The. distribution, characteristics, and physical properties of the Jersey scrub 

 ])ine {Pinus inops) are given. 



Notes on the Noble fir (Abies nobilis), J. ii. Peters {Foreslnj and Irrig., 8 

 {1902), No. 9, pp. 362-366, figs. 3). — Based upon investigations conducted during the 

 summer of 1901, an account is given of the utility, distribution, growth, etc., of this 

 fir, which is confined to the Nortwestern portion of the United States, along the 

 slopes of the Cascade Mountains. The rate of growth of seedlings during the first few^ 

 years is slow, and a marked characteristic of this species is its intolerance of shade. 

 Even the young seedlings require no shade when growing naturally, and are found 

 only in clearings caused by fire or lumbering. The tree is subject to a number of 

 diseases, the most severe of which are Erhinodontinm tinctonmn, Trainetes plni, and 

 PoJiJiioras sell ivcni itzii . 



The treatment of spruce in artificial plantations, C. Broilliard {Rev. Eaux et 

 Forcts, 41 {1902), No. 1, pp. 1-9) .—The adaptability of spruce to artificial plantations, 

 the best distances of planting, methods of thinnmg, production, etc., as shown by 

 numerous investigations, are discussed. 



Note on the fuel value of cottonwood, C. E. Bessey {Abs. in Science, n. ser., 16 

 {1902), No. 395, p. 139].— There is said to be much prejudice against this tree hav- 

 ing any value except for shade and wind-breaks, its fuel value being considered very 

 low. Careful measurements and calculations, made by the writer, show^ that on 

 account of its rapid growth the cottonwood {Popidvs delloidea) produces more heat- 

 yielding fuel in a given time than any other commonly planted tree. 



Some recent advances in the fireproofing treatment of wood, S. P. Sadtler 

 {Science, n. ser., 16 {1902), No. 402, pp. 424-428).— A brief review is given of the 



