708 PROTECTION AGAINST DISEASES. 



for damage done to vegetation. Estimates of the value of the 

 damage must be made in accordance with the principles of 

 forest valuation, and involve much difficulty. More will not 

 be said on this subject here, but references are given below* 

 to German books specially dealing with it. 



• Kraft, " Ueber die Berechnung der durch Hiittenrauch veranlassten Schadi- 

 gung von Hokbesfiinden," " Ztschift. £r, Frst. u. Jgdw.," 1887, p. 270 ; lludnick, 

 Id., 1SH9, p. 417. 



rig. 300.— Woodland Gladu near Cradley, in tlie lilack Country. 

 (Midland Reafforesting Association.) 



