PARK AND CEMETERY 
240 
Tlie Arnold Arboretum, Boston, Mass. 
(Continued.) 
The botanical disposition of the trees starts with 
the Magnolias at the Museum entrance and contin- 
ues in the order of their natural relation, following 
alongside the main drive to the Walter Street en- 
trance where the arrangement is 
completed with coniferae. The 
method of planting has been to 
locate four or five trees of the 
same sort in an irregular group, 
spacing individuals from 15 to 50 
feet apart. In addition to each 
group a single specimen of the 
same sort has been planted 50 to 
100 feet from the group to allow 
an unrestricted development into 
mature proportions. The varie- 
ties of each species have been 
grouped in close proximity to the 
species. 
The first planting was under- 
taken in 1882 and additional 
plantings have been continued 
ever since. The largest specimens 
in the order are 10 to 12 inches 
in trunk diameter as instanced by 
the catalpas and ashes and 20 to 
28 feet high as instanced by the 
elms. Preparation for the reception of each tree was 
made by excavating a body of soil fifteen to twenty 
feet in diameter and three to four feet deep and filling 
in with prepared soil composed of aliout two parts 
peat, six parts topsoil and two parts manure. In 
1900 a layer of peat twelve inches in depth was spread 
RHODODENDRONS IN JUNE. 
over an area twenty feet in diameter and surrounding 
the tree. This peat was dug in and the areas have 
since been under continuous and thorough cultiva- 
tion. 
Except such minor operations as the removing of 
broken or bruised limbs each tree is allowed to de- 
velop naturally. 
Specimens from ten to fourteen feet in height for 
BROOK VALLEY, ARNOLD ARBORETUM. 
the easily planted sorts to plants six inches high for 
such as some of the oaks were used in planting the 
orders. It is remarkable that some of the oaks whose 
seed were planted in turf sods to lessen the possible 
check incident to transplanting have since outgrown 
others which were planted when they were several 
feet in height. 
Practically all the shrubs not growing as under- 
growth in the woods or in their native wildness are 
thoroughly cultivated. A few sorts have plants 
planted under them for the purpose of ground cover. 
For this purpose Lonicera Japonica, Euonymus ob- 
ovata, Pachysandra terminalis, Rosa Wichuraiana 
and Hypericum adpressum are principally used. 
During the winter the plants which unduly crowd 
their neighbors are tagged and at the planting sea- 
son removed and planted elsewhere. Some of the 
shrub plantations are maintained principally as 
specimens rather than as parts of intermingled 
masses. 
Large quantities of plants are annually reared from 
seeds, cuttings and grafting. These are used to ex- 
tend existing plantations, distributed to other scien- 
tific institutions or to persons living in the vicinity 
of Boston who have special claim for such favors. 
The older trees growing in forest density are main- 
