REVIEWS 781 



IV. Hard wood, power required from 651 to 1,000 kg/cm.- 

 V. Very hard wood, power required from 1,001 to 1,500 kg/cm.^ 

 VI. Bone hard wood, power required over 1,500 kg/cm.^ 



The test specimens were rectangular pieces 2.5 cm. in thickness, 

 selected from the pith to the bark. Nine impressions were made in 

 each specimen to obtain a fair average. The tests were made in vacuo, 

 and the moisture content of the specimens varied between 10 and 16 

 per cent. Two hundred and eighty-six woods were tested, classified 

 by Janka as follows: a. native hardwoods, 128 species; h. native coni- 

 fers, 23 species; c. foreign hardwoods, 122 species; d. foreign conifers, 

 13 species. 



Determinations of dry weights, specific weights, bending strength, 

 and shrinkage were also made, and from the results Janka arrives at 

 the following conclusions : 



1. The higher the specific gravity of wood, the greater the hardness. 



2. The higher the specific gravity of wood, the greater the strength. 



3. The higher the specific gravity of wood, the greater the shrinkage. 

 Three comprehensive tables give the results of the tests in detail. 



B. L. G. 



Province of British Columbia. Report of the Forestry Branch of 

 the Department of Lands for the year ending December 31, 1916. 

 Victoria. 1917. Pp. 35. 



The first point that would strike the reader is the entire impersonal 

 character of the report. It does not appear over anybody's name ; only 

 the title page bears the names of the Minister of Lands and of the 

 Chief Forester, M. A. Grainger, in smaller type ; the transmittal to the 

 Lieutenant Governor is made by the Minister. 



The next point that would strike the reader is the purely adminis- 

 trative and business character of the document, without much argu- 

 ment or propaganda discussion, and the large amount of tabulations. 



It is a significant feature for a forest-service report to start out with 

 an account of the efiforts of the Forest Branch to extend the lumber 

 trade of the Province. A very well-conducted systematic campaign to 

 increase the market for British Columbia wood products in the Eastern 

 and Prairie provinces has been carried on ; in the Eastern provinces by 

 establishing a lumber commissioner at Toronto with an exhibit of Brit- 

 ish Columbia products to educate architects, engineers, and contractors 

 to the value of these products ; in the Prairie provinces by distributing 

 over 200,000 bulletins, giving descriptions and specifications for various 



