140 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 
for withstanding impurities in the air. The tree box thrives 
better than the normal plant in the heart of our largest centres 
of industry. 
The Gum Cistus (C. Jadaniferus) and the laurel-leaved form 
(C. lawrifolius) are two highly ornamental and perfectly hardy 
shrubs. The former has large white flowers, with a distinct 
purple blotch at the base of the petals, while the robust-growing 
C. laurifolius has pure white flowers. Both are excellent town 
plants, succeeding well even in very populous localities. 
Mahonia aquifolia, M. Bealii, and M. japonica all do fairly 
well in the town garden, but are the better of being assigned to 
select positions in the open. Good vegetable mould seems to suit 
the various species of Mahonia, and when once fairly established 
they grow and flower freely. All are shrubs of great beauty, 
the bright and showy flowers, produced in rich profusion, 
are followed by abundance of clusters of rich bluish-purple 
berries. 
The Japan Quince (Cydonia japonica) is one of the most 
beautiful shrubs with which our gardens have ever been enriched ; 
and from the number of fine healthy specimens that are to he 
found in many of our largest towns, it would thus appear to be 
particularly suitable for planting where soot and smoke are 
prevalent. The brilliant scarlet flowers, which are produced at 
a season when such are most in want, impart to well-grown 
specimens a beauty which is almost impossible to deseribe. It 
is perfectly hardy, not fastidious as to soil, and of free and easy 
growth, 
Hypericum Nepalense is the best of the St John’s worts for 
withstanding smoke, dust, and heat. It is a plant of great beauty, 
the bright foliage and abundance of large golden flowers placing 
it in the first rank as an ornamental plant. H. calycunum is also 
valuable for similar purposes ; while for edging to the shrubbery, 
or for covering bare spots, it has few equals. 
Euonymus japonicus and its silver and golden forms are most 
useful town shrubs, for they succeed well in very smoky and 
filthy localities. They are plants of great beauty, particularly 
the variegated varieties, of easy culture, and not at all particular 
as to soil in which they grow. Z£. radicans is a straggling, 
decumbent shrub, and, as it stands soot and smoke well, it is 
suitable for planting as a dwarf plant in the town garden and 
square, 
