44 



TIMBER AND TIMBER TREES. 



[chap. 



of 6, 12, 1 8 inches, etc. This evidence of the ordinary 

 rate of growth, and the time which it takes to bring 

 the various descriptions of timber trees to maturity, 

 will be of value to us when considered in connection 

 with the properties and characteristics of the timber 

 employed for architectural works. 



The number of concentric circles, or woody layers, 

 found in various timber trees, within a radius of 3, 6, 9, 

 12, i5j 18, 21, and 24 inches, measured from the pith, or 

 centre, are shown in the following table : — 



Table I. 



» These were trees of magnificent growth and first quality. t Not clearly traceable, 



