756 EXPERIMEJNT STATION RECORD. 



opened. By the time the buds were well opened growth had extended 

 from the terminal shoot down the trunk and was just Ijeuinning on the 

 lower branches. This exceptional behavior is attributed to the fact 

 that the leaves, as in the case of the pine, remain on the twigs for 2 or 

 3 3"ears. In the case of hemlock, which retains its leaves for 6 or 7 

 years, the growth at the end of May was greatest on the 6-year-old 

 twigs, and decreased up to the 1-year-old twigs, where it was very 

 slight. In the case of the bald cypress {Taxodium dhtlchiiin) the 

 conditions were quite similar to those observed for the broad-leaved, 

 deciduous trees. 



Damage to timber by acid fumes, H. S. Graves {Forester, 6 (1900), 

 jVo. 0\ jj/>. iJo, 136). — An example of injury to timber by acid fumes 

 is reported h\ the author as occurring at Ducktown, Tenn., where 

 there are extensive copper mines. The crude ore is roasted in order 

 to drive off a portion of the sulphur. The fumes, containing a large 

 amount of sulphurous acid, are carried to a considerable distance, all 

 grass being destroyed for about one-third of a mile, and at a distance of 

 one-half mile certain trees are only able to maintain a sickly existence. 

 It was found that the white pine was among the most susceptible. 

 Trees of this variet}" have been killed at a distance of 7 miles from the 

 roasting sheds. 



A provisional list of trees, in the order of their relative degree of 

 sensitiveness, is given. Tlie list, beginning with the most sensitive, is 

 white pine, hemlock, river birch, mulberrj^, white oak, chestnut oak, 

 chestnut, black oak, red oak, ash, willow, beech, poplar, blue beech, 

 bellwood, locust, honey locust, red maple, Virginia scrub pine, black 

 gum, sourwood, and dogwood. The last 3 trees in the list are said to 

 be very hardy and are found growing in excellent condition within 

 half a mile of the works. 



The forests, L. Boppe and A. Jolyet {Lcs Forets. Paris: BailUerc & Son, 1901, 

 pp. XI -f- 48S,figs. 94). — This book is largely based'upon lectures delivered by the first 

 author at the National Forestry School at Nancy. In the first chapters the tree.as 

 an individual is considered, followed with descriptions of all the more important 

 species of forest trees. The forest, its soil, climatic and reciprocal relationships are 

 discussed; after which especial attention is given to forest protection and reforesta- 

 tion. In the chapters on exploitation and protection especial attention is given to 

 the injuries to forests by man, in which fires and pasturage play an importaut part. 

 Many valuable suggestions are given relating to artificial reforestation, the value of 

 different species for different surroundings and uses being discussed. Directions are 

 given for the preparation and management of forest nurseriesand forest planting. 

 Plants suited to the different conditions are presented, attention l)eing paid to refor- 

 estation of nouagricultural lands, mountains, and the fixation of sand dunes. 



The forests of Canada, De Sehille {Bid. Soc. Cent. Ford. Belg., 7 {1900), No. 6, 

 pp. 4-51-465). — Tlie forests of Canada are described at some length, the different 

 regions being taken up in more or less detail. The coniferous sj^ecies occurring in 

 these forests are mentioned and their distril)ution l)riefly outlined. Thirty-one 

 species of conifers are found in the region indicated. 



