AVERY interesting address on the subject of choosing trees for parks and gardens, as well for their colors, in spring and autumn, as their shape and vigor of growth, was delivered by Mr. W. Paul before the Horticultural Congress at Oxford, England, July 21.

We may have spring pictures, summer pictures, autumn pictures, and permanent pictures. Summer and permanent pictures are the most valuable, because of their greater durability. Specimens of these are before you, and a list of their names will be given at the end of this paper. The materials for spring and autumn pictures can only be shown in spring and autumn. The varying tints of the unfolding leaves of some trees in spring, and the glowing colors of the leaves of other trees in autumn, must be familiar to all observers, and these trees are beautiful in their seasons, whether regarded individually, or in combination. But they are transitory. The varied and telling colors of spring, ordinarily, quickly subside into the universal green; and the bright leaves of autumn fall speedily before the frost and gales of that season. Yet, both are desirable. The warm, red and yellow tints of the unfolding leaves are peculiarly cheering in the cold days of early spring, and should be introduced freely when planting.

The splendor of the American forests in autumn is a theme on which many travelers have loved to dwell, and leaves from these forests may be seen in that admirable institution, the South Kensington Museum. The trees we have long had under cultivation, and they are not only available but capable of being wrought up with magnificent effect in this country. Among the most effective of spring trees the Corstorphine Plane (Acer Pseudo-Platanus flavo-varie-gatum), yellow; the Acer colchioum rubrum (red); the purple Horse Chestnut (AEsculus Hippocastanum purpureum), purple; and the Silver Poplar (Populus argentea), white, may be instanced. The shades of green at this season are also • innumerable, although for the most part gradually subsiding into one nearly uniform tint. The brightest among the leaves of autumn are, perhaps, the Scarlet Oak (Quercus cocoinea), the Liquidambar (L. styraciflua), the Stag's-horn Sumach (Rhus typhina), the Ostrya virginica, and several varieties of Cherries, Pears and Maples; these usually die off bright red.

Of yellow shades may be instanced the Lombardy and Ontario Poplars (P. fastigiata and P. candicans), the Norway Maple (Acer platanoides), the Horse Chestnut (AE. Hippocastanum), the Salisburia adiantifolia, the Lime (Tilia europaea), the Tulip tree (Liriodendron tulipiferum), the White Mulberry (Morus alba), the Gleditschia triacanthos, the Magnolia tripetala, the Juglans amara, the Acer Negundo, the Kolreuteria paniculata, the Birch (Betula alba), and certain varieties of Cherries, Pears, Thorns, and Maples.

As examples of planting for pictorial effect, nothing can be more beautiful in the flower garden than pillars or columns of Ivy, provided that they be appropriately placed. Here we have a dark green, light green, green blotched with gold, and green-edged with silver, all calculated to form permanent pictures. Standard and pyramidal golden Yews and golden Hollies, also, form beautiful permanent pictures in the garden. All permanent pictures are, of course, also winter pictures, but the common Beech (Fagus sylvatica) deserves special notice; it holds its reddish, brown leaves throughout the winter, and this color stands in warm and beautiful contrast with the Pines and other evergreens at that season. The white bark of the Birch, the white, purple, and yellow bark of certain species of Willows, the red and yellow berries of the Holly, and the yellow and black berries of the Privet, are also invaluable for winter decoration. I have often admired the effect of three large trees placed in juxtaposition in a garden in my neighborhood, whether by accident or design I have no means of ascertaining. Near the bend of a river is a Weeping Willow, the pale, green, drooping branches appearing in the distance almost to sweep over the stream.

Behind rises a mass of the dark, feathery Yew, the plumes of foliage waving in beautiful contrast of motion, form and color. Still farther behind there appears in spring rigid masses of Apple blossom, the snow-white, crimson-tinted flowers blending in beautiful contrast with the dark and pale green of the Yew and Willow.

A. - Summer Pictures

1. Light Green

Larix europaea; Taxodium distichum; Gleditschia triacanthos;

Juglans laciniata; Acer Negundo; Tilia curopaea; Catalpa syringaefolia; Robinia Pseud-Acacia; Platanus occidentals.

2. Dark Green

Fraxinus crispa; Fraxinus monophylla; Alnus glutinosa; Cyti-sus Laburnum ; Pyrus Aucuparia; AEsculus Hippocaatanum ; Betula nigra ; Fagus sylvatica; Ulmus, various kinds; Quercus Cerris.

3. Reddish Purple

Fagus sylvatica purpurea; Ulmus campestris fol. purp.; Acer Pseudo-Platanus fol. purp.; Acer japonicum atropurpureum; Corylus Ave liana pur-purea ; Querous pedunculata purpurea; Quercus nigra ; Burberis vulgaris fol. purp.

4. Yellow Or Golden

Quercus Cerris variegata; Quercus Robur var. Concordia ; Fraxinus aucubaefolia; Castanea vesca variegata; Sambucus nigra aure-ovarigata; Symphoricarpos vulg. fol. aureis; Spiraea opulifolia lutea; Robinia Pseud-Acac. aurea.

5. White Or Silvery

Populus argentea; Acer Negundo variegatum; Tilia argentea; Pyrus vestita ; Pyrus salicifolia ; Salix argyrea; Sbepberdia argentea; Hippo-phae rhamnoides.

B. - Permanent Pictures

1. Light Green

Pinus pyrenaica; Cedrus Deodara (the green variety); Abies orientalis; Abies rubra; Ilex balearica; Juniperus thurifera; Juniperus virginiana; Juniperus chinensis.

2. Dark Green

Pinus insignis; Pinus austriaca; Picea Nordmanniana; Arauca-ria imbricata; Cupressus Lambertiana ; Quercus Ilex; Cerasus lusitanica; Philly-rea; Garrya elliptica; Hollies and Yews, various.

3. Purple

There are no suitable purple evergreens, consequently this color is restricted to summer pictures.

4. Yellow Or Golden

Abies excelsa finedonensis ; Cupressus thyoides variegata; Ilex Aquifolium aurea; Thuja aurea; Thuja elegantissima; Taxus baccata aurea; Euonymous japonica flavescens; Retinospora pisifera aurea.

5. White Or Silvery

Cedrus Deodara (the glaucous variety); Pinus excelsa; Pinus monticola; Pinus nivea; Abies alba glauca; Ilex Aquifolium argentea; Juniperus virginiana glauca ; Rhamnus Alaternus fol. argentea.