The =Lime= (_Tilia europæa_).—Where the situation is not too confined, and where soot and smoke do not abound, the lime may, and does, succeed; but in the worst parts of the metropolis it soon shows signs of distress, the tops of the branches dying off, and the whole tree sooner or later showing the fierce struggle it has to endure with smoke and fumes. As an avenue tree in the more airy and pure parts of a town, the lime has certainly few equals, its general contour and the pleasing shade it affords being points of special recommendation. The =Sycamore= (_Acer pseudo-platanus_).—This tree may be classed as amongst the most useful for planting in smoky towns. In Warrington, where the noxious emanations from alkali and other chemical works are most disastrous in their effects on vegetation, the sycamore is one of the few trees that grow satisfactorily. Being a rapid and strong grower, it is thus seen to be, for a certain time at least, unaffected by its inimical surroundings. The variegated variety would seem from recent experiments to be preferable, and better adapted for smoky localities than the normal form. The =Weeping Ash= (_Fraxinus excelsior pendula_) would seem to be superior to the common ash for planting in towns. It thrives satisfactorily in many of our largest centres of industry—to wit, London, Liverpool, Glasgow and Manchester. The =Horse Chestnut= (_Æsculus hippocastanum_) may be seen in a fairly satisfactory way in many town parks, but only where it is not exposed to smoke and soot to any great extent. In confined spaces both it and the =English Elm= (_Ulmus campestris_) soon show signs of distress, the points of the branches gradually becoming unhealthy, and the trees dying off prematurely. Taking everything into consideration, neither of these trees can be recommended for planting in smoky districts. The =Birch=, =Walnut=, =Hornbeam=, and one or two kinds of =Willow= will succeed in the less smoky parts of a town; but they are not to be recommended for planting where the air is constantly impregnated with soot and dust. The =Mountain Ash=, or =Rowan Tree= (_Pyrus aucuparia_) and =Bird Cherry= (_Cerasus Padus_) are both good town trees, and excellent examples of both may be seen in the back streets and slums of London. =Sophora japonica= is well worthy of recommendation as a tree that is admirably suited for planting in towns. It is of large and rapid growth, with elegant dark green pinnate leaves. Being a native of China and Japan, it may not be perfectly hardy in the northern portions of the British Isles, but it succeeds well in Southern England, and thrives admirably in the most smoke-infested parts of London. =Thorns= of various kinds succeed well in towns, but they must not be recommended for the most smoky and confined localities. The =Tansy-leaved Thorn= (_Cratægus tanacetifolia_) is an excellent member of the family for town planting. SHRUBS