_. in the direction of 
_ Caaprer VI. 
The Preparation of a Collection. 
THREE specimens are needed of each kind of tree: one, 
a branch showing the flowers; another, showing the fruit 
—one of these, and in many eases 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 E 
surface so cut as 
to show the wood A 
the silver: grain, 
radial section ; 
with another sur- 
face cut in the 
direction of the H 
annual _layers, 
tangential section; 
and with a third 
eut across the 
grain,  cross-sec- « 
tion. It should 
be a specimen old 
enough to show 
the change of 
color in the heart- 
wood. By taking Fig. 16. 
a limb or trunk 8 inches in diameter, all these points can 
be secured. A specimen cut as shown in the figure wiil 
illustrate all the desired points. Side E F G shows sap- 
and heart-wood in tangential section; side A BD C shows 
the same in radial section; end A B F 5, in cross-section ; 
35 
