48 Forestry Quarterly 



to write the first American book covering the subject of timber 

 preservation systematically in its broad aspect. 



The scope of the book is best seen from the readings of the 

 twenty chapters, which are as follows: (1) Introduction; (2) 

 factors which cause the deterioration of structural timber; (3) 

 effect of the structure of wood upon its injection with preserva- 

 tives; (4) preparation of timber for preservative treatment; (5) 

 processes used in protecting wood from decay; (6) preservatives 

 used; (7) construction and operation of wood preserving plants; 

 (8) prolonging the life of cross-ties, (9) of poles, (10) of fence 

 posts, (11) of piling and boats, (12) of mine timbers, (13) of 

 paving blocks, (14) of shingles, (15) of lumber and logs; (16) 

 protection of timber from fire, (17) of wood from minor destruc- 

 tive agents; (18) strength and electrolysis of treated timber; (19) 

 use of substitutes for treated timber; (20) appendices. 



This book should be heartily welcomed by all persons interested 

 in timber preservation, and teachers of the subject will find it an 

 excellent text book. 



S. J. R. 



Forest Valuation. By Herman Haupt Chapman, Al.F. Wiley 

 & Sons, New York. 1915. Pp. 310, 8°. 



Teachers and students of forestry' will welcome the appearance 

 of Professor Chapman's new book, "Forest Valuation." Hereto- 

 fore this subject has been a rather difficult one to grasp, due 

 largely to the fact that it has not always been preceded by a 

 course in general economics, at least in sufficient detail to enable 

 the student to understand the principles underlying the business 

 of forest production. This has necessitated the spending of con- 

 siderable time in very elementary discussions of these economic 

 principles. Too much time also has been devoted to the explana- 

 tion and derivation of necessary formulae. 



This volume will overcome these difficulties to a great extent, 

 and will enable the students to spend more of their efforts on 

 the interpretation or analysis of practical problems which arise 

 in forestry. 



Professor Chapman begins with four chapters on economic 

 principles — brief, it is true, but still sufficient to recall the teach- 



