(2) 



A few other points should become well fixed in mind : 



1. Since the entire Pinetum lies south of the Museum, the direc- 

 tion "north" always means generally toward the Museum from any 

 point where it may be given. Correspondingly, "south" will always 

 be in the oposite direction, "west" to the left and "east" to the 

 right, if one faces north. 



2. The term "ahead" means in the general direction of travel 

 as indicated on the maps. 



3. The Guide endeavors to mention every individual needle - 

 leaved tree that lies in the course of travel, but disregards all the 

 broad-leaved trees, except one, that may be encountered. That one 

 is the very first in the Guide, Ginkgo. Consequently, the Guide 

 must be followed carefully that no trees are missed. If confusion 

 does occur (which may happen through changes that time will 

 bring), one may go ahead until he meets the next unquestionable 

 tree and then work backwards. 



4. Every tree in the Garden has been provided with a copper 

 tag, 3^ inches long, which bears the tree's name. These tags hang 

 on some branch at convenient height and always serve as a check. 



5. If one wishes to see a particular kind of tree he must con- 

 sult the index and find the page on which that tree is described. 

 Then by turning back he will find the Section containing the tree 

 and reference to a map locating it. The name of the tree may 

 appear on the map and if not, he can find the tree by tracing 

 through the section until he arrives at it. 



Each group or genus of trees is considered in this Guide, first, 

 by a specific consideration of the trees as they stand in the Garden. 

 Then follows a general discussion of the genus as a whole. 



Certain limitations must be appreciated in using this Guide : 



1. It is obviously impossible to furnish all the information that 

 every class of reader may desire. The trees are treated from the 

 viewpoint of their popular identification, their economic and orna- 

 mental use and other interesting relationships. This information 

 may prove sufficient for some and should serve as a stimulus for 

 further investigation on the part of others. The Garden main- 

 tains a very large botanical library and a collection of many thou- 



