Text Appearing Before Image: ormaterial replaced with one or two loads of good loam.To allow water and air to reach the roots concrete pave-ments must be kept several feet away from the base ofthe tree. A continuous grass or gravel planting stripfrom three to six feet wide is the ideal arrangement forstreet trees and should be provided where the best treesare desired. Kinds of Trees Suitable. Only a few kinds of treeswill grow satisfactorily in our streets. The Carolina poplarand silver maple, the most frequently planted trees inPhiladelphia, are almost entirely unsuited to the purpose.They are Loth short-lived, weedy trees, which require con-stant topping to prevent them from becoming dangerous,and their soft, brittle wood decays readily. The roots in-vade and clog drain pipes and heave sidewalks. Good trees for street planting are the oriental plane,pin oak, gingko and ^N^orway maple. The plane will thrive,where few other trees grow, and it may be pruned into any UU H HO o )CO O u (0 CO oa:o ou h-couoo ID <o Text Appearing After Image: desired shape or size, thus fitting it for either wide ornarrow streets. The other trees require more moisture andlarger open spaces about them, but have darker greenfoliage and cause less litter on the pavementj as they do notshed their bark, like the plane. In the suburban sectiontulips, sugar maples, scarlet and red oaks, sweet gums,ashes and Crimean and silver lindens make excellent streettrees. Carefully grown nursery trees, with straight stemsand an abundance of fibrous roots, are alone suitable forstreet planting, as only such trees are likely to thrive andmake well balanced specimens, and to secure handsome,even rows only one kind of tree must be planted on astreet for a series of blocks. The trees should be plantedat least twenty-five or thirty feet apart to allow suflScientsunlight and air for their proper development. Tree Guards. Where a tree stands near a curb, a treeguard is required to protect the trunk from horses teeth.Many thousands of the existing trees have already
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