Current Literature. 285 



step of the process are discussed in detail, figures given, and com- 

 parisons made with the different species logged. 



In the article on the "Forest Types of the Gila National Forest" 

 five types are described, with an interesting consideration of the 

 relation of these to the causes and extent of forest fires and 

 methods of fighting them. The method of restocking of burned 

 areas in each type is given. 



Two articles deal with contour mapping, one describing the use 

 of the Roth board for quick results, and the other the use of the 

 aneroid barometer for very rugged country. 



Under the heading "Forestry in Eastern Canada" is given a 

 description of the operations of the Laurentide Paper Company 

 of Quebec, as an example of forestry practice. 



There is an article giving the results of experiments on season- 

 ing and preservative treatment of Western Red Cedar poles, and 

 Western Yellow Pine as a substitute for the former. 



The account of the Nebraska forest fungi is continued, the 

 present section dealing with the commoner leaf-inhabiting forms. 

 The list of native and exotic trees of Nebraska in the preceding 

 volume is followed up by a list of forest trees on the Pollard 

 estate, comprising forty-nine species, seven of them exotic. 



The Rodman tree-planting machine used by the Union Pacific 

 Railway Company is described in another article. This is prac- 

 tically the Stratton machine used over twenty years ago in the 

 same state. It is interesting to note the tendency towards ma- 

 chinery as labor grows scarcer. 



There are various other articles, including a bud and twig key ; 

 a description of a form of Aspen with obovate leaves ; the collect- 

 ing of Lodgepole Pine cones by robbing squirrel hoards, with the 

 method of seed extraction in the field ; and a description of the 

 spring frost damage to some twenty broad-leaved tree species. 



The publication is a creditable production and splendidly illus- 

 trated. 



J. H. W. 



Forest Products of Canada, igog. Cross Ties. By H. R. 

 MacMillan. Bulletin 14, Forestry Branch. Ottawa, Canada. 

 1911. Pp. 8. 



In 1909 the steam and electric railways of Canada purchased 

 14,178,241 cross ties costing $5,210,490 at the point of purchase. 



