TIMBER 



SOME OF ITS DISEASES. 



CHAPTER I. 



TIMBER, ITS GENERAL CHARACTERS AND 

 STRUCTURE. 



ON carefully examining the clean-cut end of a 

 sawn log of timber, it is easy to convince ourselves of 

 the existence of certain marks upon it which have 

 reference to its structure. These marks will vary in 

 intensity and number according to the kind of tree, 

 the age at which it is felled, and some other circum- 

 stances, which may be overlooked for the present ; 

 but in a given case it would be possible to observe 

 some such marks as those indicated in Fig. i. In the 



e B 



