August 24, 191 1] 



NATURE 



243 



dietary, in which the protein content is only one-half 

 to one-third that contained in the ordinary standard 

 dietary, will maintain the body in a satisfactory state 

 of health, and that an ordinary dietary does give some 

 excess which is injurious to health. At the same 

 time, it is recognised that further observations are 

 required before we can accept Chittenden's results as 

 giving a standard for universal application. 



Milk and milk products and eggs are next con- 

 sidered, and then animal foods and their composition. 

 The information given is both varied and voluminous ; 

 for example, the influence of different breeds of cows 

 on milk production is considered, and the usual Scotch 

 method of cutting up an ox is illustrated. Full tables 

 are given of the composition, constituents, and nutri- 

 tive values of all foods — flesh, farinaceous, fruit, 

 vegetable, and mineral. The condiments and alcohol 

 are also considered. As regards that vexed question, 

 the use of alcohol, the author expresses the opinion, 

 with which we fully concur, that 



" while the use of alcohol in the treatment of disease 

 is now very restricted, there is no question as to its 

 undoubted value in the treatment of certain diseases, 

 more especially in their critical stages. . . . We must 

 recognise that alcohol is a very valuable therapeutic 

 agent in the treatment of some diseased conditions." 



The dietetic treatment of disease is treated very 

 fully and completely. Alternative views are stated 

 with fairness and in a broad-minded manner. Not the 

 least valuable parts of the book are the complete 

 cookerv recipes which are included ; in this respect 

 the work becomes one of very real practical worth 

 and supplies a decided want. For them the author 

 expresses much indebtedness to his wife. 



We have read the book with great interest, and can 

 recommend it as a complete and practical epitome for 

 the student of dietetics, and one which should be of 

 much value to everv practising phvsician. 



R. T. H. 



FOREST MANAGEMENT. 

 Schlicli's Manual of Forestry. By Sir Wm. Schlich, 

 K.C.I.E., F.R.S. Vol. hi., Forest Management. 

 Fourth edition, revised. Pp. x + 403. (London : 

 Bradbury, Agnew and Co., Ltd., 191 1.) Price o..s. 

 net. 



THE fourth edition of the third volume of the above 

 " Manual of Forestry " contains somewhat more 

 matter than its predecessor. The volume is divided 

 into four parts, in which the various departments of 

 forest management are dealt with. A strong feature 

 of the new and revised edition is the number of prac- 

 tical examples given to illustrate the use and applica- 

 tion of the various formula. 



Part i. deals with forest mensuration. A concise 

 description of the various measuring instruments is 

 given and also the procedure generally followed and 

 the formulae used in calculating the volume of single 

 trees and whole woods. Determination of age and 

 increment are also dealt with. This subject is treated 

 of first, as it naturally forms the foundation of forest 

 management and leads up to what follows in the 

 succeeding parts. 



no. 2182, vol. 8;] 



Part ii. — forest valuation — is devoted to the con- 

 sideration of forest capital and the returns yielded 

 therefrom. The author has been very successful in 

 his method of presenting and explaining this difficult 

 and intricate subject to the reader. He starts by 

 analysing the forest value into its several components, 

 such as the forest soil, the growing stock, the forest 

 as a whole, and the rental derivable from the soil or 

 the forest as a whole. In order to deal with this sub- 

 ject fundamentally the author gives a preliminary 

 chapter divided into four sections. Section 1 shows how 

 the value of property is determined ; section 2 shows 

 how the rate of interest applicable to the forest industry 

 may be fixed ; section 3 contains the formulas neces- 

 sary for calculating with compound interest; and sec- 

 tion 4 contains an explanation of the methods of esti- 

 mating receipts and expenses. With these preliminary 

 matters made plain, he proceeds in the next four 

 chapters (occupying twenty-six pages) to deal with 

 valuation of forest soil, growing stock, whole woods 

 or forests, and the determination of the rental of 

 forests. Chapter vi., which concludes this part, 

 treats of the methods of calculating the financial re- 

 sults of forestry. This subject is usually dealt with 

 separately under the heading " Forest Statistics," but 

 it has been here condensed in a perfectly efficient 

 manner into about sixteen pages as a logical 

 appendage to forest valuation. 



Part iii. — the foundations of forest management — 

 likewise contains six chapters. A very interesting 

 introduction is prefixed which sets forth the aims and 

 objects of systematic forest management and forest 

 working plans. The succeeding five chapters deal re- 

 spectively with increment, rotation, normal age, 

 classes, normal growing stock, and normal yield, 

 while in the final chapter the relation between incre- 

 ment, growing stock, and yield is discussed. 



Part iv. explains the preparation of forest working 

 plans. This is the direct sequel and outcome of the 

 previous part. In preparing his working plans the 

 forester aims at bringing every part of his woods and 

 forests into a state as near theoretical perfection as 

 possible. His endeavour is to regulate and bring into 

 a normal condition the increment, rotation, age- 

 classes, growing stock, yield, &c. This necessitates 

 an experienced survey and a very critical knowledge 

 of the forest and its environment. The references in 

 this part to pages and chapters of the previous volumes 

 of the manual indicate in themselves that the forester 

 must be thoroughly acquainted with the fundamentals 

 of svlviculture before he can attempt to construct a 

 rational working plan which is possibly the most 

 important, and at the same time difficult, thing to do 

 in the whole art of forestry, but, as has been indi- 

 cated, the author has so clearly and thoroughly ex- 

 plained the fundamentals that the intricacies of the 

 working plan may be easily understood. At the end 

 of the book are given appendices containing many 

 useful tables, such as tables for measurement, com- 

 pound interest, and yield, working-plan schedules, 

 and an index. 



The author is to be congratulated upon the produc- 

 tion of this volume, which can be warmly recom- 

 mended to all students of forestry, foresters, and 



