PREFACE. IX 



own experience, extending over many years, utilized chiefly 

 the following works : 



For Forest Mensuration : 



(1) Schwappach, " Leitfaden der Holzmesskunde." 



(2) Baur, " Holzmesskunde." 



For Forest Valuation : 



(1) G. Heyer, " Waldwerthrechnung." 



(2) Wimmenauer, " Grundriss der Waldwerthrechnung." 



In compiling the tables at pages 394 to 397, I have used 

 those appended to the above-mentioned two works, and I 

 desire to express herewith my best thanks to the family of 

 the late Professor G. Heyer (under whom I studied forestry), 

 and to Professor Wimmenauer, for the permission which they 

 kindly gave me to do this. 



For Forest Working Plans : 



(1) Heyer, " Die Waldertrags-Regelung." 



(2) Judeich, " Die Forsteinrichtung." 



As Judeich's " Bestandswirthschaft " is the method of regu- 

 lating the yield of forests which commends itself to me more 

 than any other, I have naturally largely drawn upon Judeich. 

 At the same time I have introduced certain modifications into 

 the method where it seemed too rigid. 



I have also made occasional use of, 



(1) Puton, " Traite d'Economie Forestiere." 



(2) Hess, " Encyklopadie " und " Methodologie der 



Forstwissenschaft," Part III. 



I am indebted to my colleague, Mr. A. Lodge, Professor 



