Some trees are omitted, not so much on account of doubtful qualities but because the list already offers ample opportunity for selection from the large number named. There are, doubtless, several other species which might be planted with satisfactory results, but many of them have defects which should be considered carefully before making a selection.
The Ash-leaved Maple, a short-lived tree, puts out its lower branches too near the ground to permit its use on streets. The Canoe Birch does the same, and if the lower branches were cut oil the pyramidal form of the tree would be destroyed and its beauty greatly impaired. The Kentucky Coffee Tree is so unsightly in winter, resembling then a dead tree, that it is better omitted in street planting, especially as it will thrive only in good moist ground. The European Ash lasts but a tew years in our climate, and is in no way superior to our .American White Ash. The Sour Gum or Pepperidge is a beautiful tree in autumn, but it is too apt to fail in transplanting. The Mountain Ash and Flowering Dogwood are beautiful, but the bright red berries of the one and attractive flowers of the other invite injury ; their proper place, if on a street or road, is inside the fence and in some dooryard. The Sycamore Maple has a fine appearance and dense shade, but with so many other Maples, it is hardly needed; like the Copper Beech and Schwedler's Crimson-leafed Maple, its place is in the park or arboretum. The Yellow Wood is one of our neatest, prettiest trees, with cream-colored flowers that attract swarms of bees when in bloom ; but it has low blanches, and its wood is so brittle that the trunk is very apt to split downwards from where it first divides. The Paulownia, Koelreuteria, and other exotics, beautiful and attractive as they are, should be reserved for private grounds or secluded parkings where they can receive the care and attention which they always require. The Carolina Poplar, or Cottonwood, is often recommended because of its very rapid growth: but this tree sheds a downy cottony tuft which clings to the clothing of passers-by, causing so much annoyance that, in many towns, orders were issued for its removal.* All of these species are pleasing in appearance, and each has some good quality to commend its use. but they should be reserved for lawns, dooryards and parks, where they will appear to better advantage than along the curbstones.
None of the evergreens have a place on the list, for they are of little use as shade trees. Most of them are forest trees, which, when growing in the open, assume a different habit, their lower limbs commencing at the ground. A row of White Pines, properly trimmed, might be used on a country road, and the Tamarack, or American Larch, looks well in the farmer's dooryard ; but .ill evergreens require skill and great care in transplanting, and seem out of place in city streets. Many of them, however, are highly ornamental, and very useful for park and lawn purposes; .md then there is the unquestionable advantage which evergreens have in winter, giving beauty to a roadside when all the other trees are bare.