266 



lumbering' and the destructive distillation of wood, and the 

 processes of manufactures of wood pulp, cellulose, maple sugar, 

 resin, turpentine and tan bark, afford a mass of readable and 

 important iniormation. The chapter on the forest trees and 

 products of the tropics is doubtly interesting to Hawaiian read- 

 ers and we would gladly have seen this department of the book 

 greatly increased. While from a botanical and scientific point 

 of view and also from that of the application of forestry 

 methods the book affords a valuable store of accurate informa- 

 tion, it is evident that the author's knowledge of tropical agri- 

 culture is not so well grounded as that which he possesses of 

 the forestry conditions in more northern countries. One or 

 two references to the Hawaiian Islands are somewhat mislead- 

 ing, as for instance the statement relating to the export of 

 candle-nut oil from the "Sandwich Islands." 



Apart from one or two inaccuracies of a like description, 

 which in no way detract from the value of the work in its 

 utility to forestry students and which may be looked for in 

 the compilation of numerous facts embracing a knowledge of 

 many countries, the book is to be commended for its scope and 

 practical utility. It concludes with a list of fifty important 

 American forest trees, twenty-five of which are conifers and 

 twenty-five hardwoods. To each species a general description 

 is given together with its economic use and method of propaga- 

 tion. A comprehensive index adds greatly to the usefulness 

 of the work. 



All who are attracted by a most interesting subject and who 

 do not wish to be oppressed by a multitude of burdensome 

 technical terms will derive much enjoyment and information 

 in the perusal of Practical Forestry. 



MASTIC FOR LIMING RESU.RVOIRS. 



The mastic recommended by the Texas Experiment Station 

 for liming reservoirs and irrigation ditches is as follows : 



An even slope of 45 degrees is given to the walls and a coat 

 of mastic applied throughout to a thickness of one-half inch 

 over the inner side of the walls and on the bottom of the reservoir. 

 The m'astic is applied at tlie rate of 52 pounds per square yard 



