130 HISTORY AND GEOGRAPHY OF TREES. PART I. 
not had an equal chance of displaying themselves, or of attain- | 
ing that magnitude and character which they ought to have to 
answer the ends of an arboretum. (See our ideas more at 
length, and illustrated by figures, in the Gard. Mag., vol. v. 
p- 346. and fig. 79., and vol. vi. p.250. and fig. 44.) There is 
an arboretum in the Liverpool Botanic Garden, in that of Hull, 
in that of Colchester, in that of Manchester, in that of Bir- 
mingham, and one is just commenced in that of Sheffield. The 
Caledonian Horticultural Society have an arboretum in their 
experimental garden at Inverleith; that of the Botanic Garden 
of Edinburgh has been much increased; and there is a good 
one in the Glasgow Botanic Garden. In Ireland, the Trinity 
College Botanic Garden was laid out by Mr. Mackay in 1808, 
and at first contained only three acres. In 1833 two acres 
more were added, which are principally occupied by ornamental 
trees on a grass lawn, with surrounding borders for showy 
herbaceous plants, and trees and shrubs which require the pro- 
tection of a wall. An arboretum was commenced in the garden 
of the Cork Institution, soon after the foundation of the Trinity 
College Botanic Garden; but that institution has been since 
broken up, and the plants and trees of the garden sold and 
dispersed. The Belfast Botanical and Horticultural Society 
established a garden and an arboretum about 1830. ‘The Glas- 
nevin Garden belongs to the preceding century. 
The British nurserymen have not been wanting in forming — 
arboretums. Preeminently among them stand the Messrs. 
Loddiges of Hackney, who have been assiduously collecting 
trees and shrubs from all parts of the world, since the middle of 
the last century; and in the year 1818, when these amounted 
to above 1200 species and varieties, exclusive of azaleas, roses, and 
willows they were arranged alphabetically on the right hand side 
of a walk forming a scroll like the Ionic volute, extending over a 
space of upwards of seven acres, commencing with the letter A, 
at the outer circumference, and terminating with Z (Zizyphus) 
near the centre. The centre itself forming the eye of the arbo- 
retum consists of ten concentric zones, devoted to peat earth 
plants, commencing in the outer zone with Andromeda, and 
terminating in the inner one with Vaccinium. ‘The collection of 
willows, which is very extensive, is placed by itself in the cir- 
cumference ; as is also the collection of yuccas. The collection 
of roses, which exceeds 1500 sorts, is planted on the left hand 
side of the scroll walk, and their number being about the same, 
as that of the trees and shrubs which do not require peat earth, 
they extend to the commencement of the concentric zones. The 
surrounding boundary walls are covered with half-hardy trees 
and shrubs. In 1830 this arboretum was in a high degree of 
perfection, and in the autumn of that year we had sketches taken 
