uKviKws 857 



forms, administrative reports, records, and equipment. There follows 

 (page 38) a most interesting standard classification of forest types as 

 they occur in the various districts. 



The immediate object of timber surveys is stated as "primarily to 

 secure data needed in connection with timber sales." It is the policy of 

 the Forest Service to have a thorough examination made of ]:)rospective 

 timber-sale areas as a basis for determining whether a sale is silvicul- 

 turally desirable as well as for the timber appraisal. The preparation 

 of a topographic map is a requisite ; therefore timber surveys also give 

 data needed in the preparation of plans for fire protection and forest 

 improvements. Since timber surveys are essential to intensive forest 

 management, they will be extended as rapidly as funds are available. 



Up to and including the fiscal year 1916, 47,291,660 acres have been 

 cov^ered by extensive timber surveys and 20,815.798 acres by intensive 

 methods. It is estimated that there remain 90,000,000 acres of National 

 Forest lands bearing timber of commercial importance to be covered by 

 surveys before complete data essential to forest working plans are 

 secured. 



Under the caption of "Yield and increment," it is stated that ".so far 

 as practicable, the data secured on timber-survey projects will be util- 

 ized in the construction of yield tables showing the actual yield of the 

 watershed covered. Actual or empirical yields of the area in question 

 may be secured from data on even-aged stands where the tallies are 

 kept separate by type and age classes and in uneven-aged stands upon 

 which the area of growth below merchantable size is determined." 



A. B. R. 



Canadian Douglas Fir: Its Meclianical and Physical Properties. 

 Bulletin No. 60, Forestry Branch, Department of .the Interior, Canada. 



This publication, the first to deal with the results of strength tests 

 made at the Canadian Forest Products Laboratories at Montreal, pre- 

 sents data on five trees of Douglas fir from each of three localities of 

 growth and represents two types (coast type from Abbotsford. B. C. 

 and mountain type from Golden, B. C, and Morley, Alta.). It is 

 shown, as has been done by our own Forest Products Laboratory, that 

 the coast type fir is considerably superior to the mountain type. Atten- 

 tion is called to the fact that, in general, the properties are well corre- 

 lated to the climatic conditions under which the trees were grown. The 

 coast type, of course, grew under the conditions of higher temperature 

 and heavier rainfall. Of the mountain localities that having slightly 



