At several places in and around the great metropolis—and in places, too, where one is almost stifled with the fumes from chimneys—this tree may be seen in almost as fresh a condition as those in the open country. The =Ailanthus= or =Tree of Heaven= (_Ailanthus glandulosa_) may be seen in a very flourishing condition in many of the largest centres of industry in Southern England. It has been largely planted in many Continental cities, and has proved itself one of the few trees that is capable of withstanding the impurities of a town atmosphere. The =Black Italian Poplar= (_Populus monilifera_).—Next to the plane amongst forest trees I consider the black Italian Poplar to be the most valuable for planting in smoky towns. As a proof of this there are to be seen numerous fine specimens of this tree in a flourishing condition, and clothed with the most healthy foliage, in some of our large cities—to wit, London, Glasgow, Liverpool and Manchester. The =Canadian Poplar= (_P. canadensis_), and its variety, _P.C. nova_, are excellent trees for planting in smoky localities. The former succeeds admirably in the very centre of Sheffield, in the old parish churchyard, where for hundreds of yards around not a particle of living vegetation is to be seen. The variety _nova_ is a very superior tree for street planting, it being far more ornamental, and of more rapid growth than the black Italian poplar, and equally noticeable for retaining a healthy and flourishing condition under the adverse circumstances connected with a town atmosphere. The =Abele Poplar= (_P. alba_) grows with great freedom when subjected to smoke and foul air. In the very heart of our largest towns it may be seen flourishing in a manner that is almost incredible. The =Lombardy Poplar= (_P. fastigiata_) is another tree that has been planted with some success in and around many of our largest cities, but it cannot equal any of the foregoing for withstanding the baneful effects of a tainted atmosphere. In the outskirts of towns, where air is purer than amid chimneys pouring forth their volumes of smoke, the Lombardy poplar succeeds fairly well, and imparts an air of grandeur that could hardly otherwise be obtained. The =Cucumber Tree= (_Magnolia acuminata_).—Few planters are aware of how valuable this tree is for withstanding the germs and soot of large towns. Experiments have, however, resulted in this highly ornamental tree being added to the list.