Practical Sylviculture 139 



wood is a part of the woody stem. The large amount of 

 a>h from the cigar shows the amount of fertility drawn 

 from the soil. The comparatively small amount of ash 



CIrc:itly in n<'<-d <>f thinning. 



from the piece of wood indicates what the tree obtained 

 from the soil and stored in the wood. Tree leaves contain 

 about as much ash as tobacco leaves, I nit the tree returns 



