CHAPTEK VI. 



The Preparation of a Collection. 



THREE specimens are needed of each kind of tree: one, 

 a branch showing the flowers j another, showing the fruit 

 one of these, and in many cases both, will show the 

 leaves. The third specimen, cut from a large limb or 

 trunk, shows the bark and the wood. This should be a 

 specimen with a 

 surface so cut as 

 to show the wood A 

 in the direction of 

 the silver grain, 

 radial section ; 

 with another sur- 

 face cut in the 

 direction of the H 

 annual layers, 

 tangential section; 

 and with a third 

 cut across the 

 grain, cross-sec- ~ 

 tlon. It should 

 be a specimen old 

 enough to show 

 the change of 

 color in the heart- 

 wood. By taking **e- 16 - 

 a limb or trunk 8 inches in diameter, all these points can 

 be secured. A specimen cut as shown in the figure will 

 illustrate all the desired points. Side E F G shows sap- 

 and heart-wood in tangential section ; side A B D C shows 

 the same in radial section ; end A B F E, in cross-section j 



36 



