142 THE PLANT WORLD. 



A point worthy of attention is the relative frequency of the 

 two classes. Of the eighty aberrant leaves examined in 1905, 

 fifty-two had three terminal leaflets, while only twentv-eight had 

 four. It would seem at first that if the form with four ter- 

 minal leaflets — two pairs of leaflets closely approximated at the 

 tip — be the intermediate stage between the normal and the im- 

 paripinnate type, it should also be intermediate in frequency, but 

 this is clearly not the case. It seems not improbable that pri- 

 mordia for both leaflets are formed, but space and nutrition are 

 sufficient for the full development of but one, and the other 

 early disappears. 



AIDING CITIES AND TOWNS TO NAME THEIR 



TREES. 



The Fore.st Service Will Identify Trees in Streets 



AND Parks. 



The increased interest in forests and forest trees which is a 

 sign of the times has. among other things, led many city and town 

 officials to seek to make known the names of trees growing in 

 streets and parks. Not only are such trees in very many cases 

 now without marks of identification, l)ut in not a few cases they 

 have been labeled with incorrect names. The Forest Service has 

 devised plans by which its cooperation may be secured in cor- 

 rectly identifying the public trees of any community which may 

 care to call upon it. 



It is remarkable how little uniformity there is in the use of tree 

 names. Even scientific names, which are. of course, always more 

 exact than the common names, are in many cases unsettled, but 

 common names are often used almost at random. In difi'erent 

 parts of the country the same species may be popularly known 

 under very different names, and, on the other hand, the same 

 name is often used in difi'erent localities for altogether different 

 trees. 



In the effort to assist toward uniformity of usage in scientific 

 names of forest trees, and also to lessen the chaos in the use of 



