Part 20

The Poplars are deciduous trees, mostly growing to a large size; natives of Europe, North America, some parts of Asia, and the north of Africa. They are all of rapid growth, some of them extremely so; and they are all remarkable for a tremulous motion in their leaves, when agitated by the least breath of wind. The species delight in a rich, moist soil, in the neighbourhood of running water, but they do not thrive in marshes or soils saturated with stagnant moisture. Their wood is light, of a white or pale yellowish colour, very durable when kept dry, not liable to warp or twist when sawn up, and yields, from its elasticity, without splitting or cracking when struck with violence; that of some species is also very slow in taking fire, and burns, when ignited, in a smouldering manner, without flame, on which account it is valuable, and extensively used for the flooring of manufactories and other buildings. Of the fifteen species of Poplar described in Loudon's Arboretum, three are believed to be natives of this country--P. canescens, P. tremula, and P. nigra.

P. canescens, the Gray or Common White Poplar, and its different varieties, form trees of from eighty to one hundred feet high and upwards, with silvery smooth bark, upright and compact branches, and a clear trunk, to a considerable height, and a spreading head, usually in full-grown trees, but thinly clothed with foliage. The leaves are roundish, deeply waved, lobed, and toothed; downy beneath, chiefly grayish; leaves of young shoots cordate-ovate, undivided fertile catkins cylindrical. Stigmas 8.

The White Poplar is commonly propagated by layers, which ought to be transplanted into nursery lines for at least one year before removal to their final situation. The tree is admirably adapted for thickening or filling up blanks in woods and plantations; and, for this purpose, truncheons may be planted from three to four inches in diameter, and from ten to twelve feet high. These truncheons have the great advantage of not being overshadowed by the adjoining trees, which is almost always the case when young plants are used for filling up vacancies among old trees. In a moderately good and moist soil, the White Poplar will attain in ten years, the height of thirty feet or upwards, with a trunk from six to nine inches in diameter.

As an ornamental tree, the White Poplar is not unworthy of a place in extensive parks and grounds, particularly when planted in lone situations, or near to water; it ought, however, to be grouped and massed with trees of equally rapid growth, else it soon becomes disproportionate, and out of keeping with those whose progress is comparatively slow. It is well adapted in our climate for a wayside tree, as it has no side branches to prevent the admission of light and free circulation of air; and also to form avenues, when an effect is wished to be produced in the shortest possible time.

The Aspen or Trembling Poplar, P. tremula, is inferior to few of its tribe, presenting the appearance of a tall, and, in proportion to its height, rather a slender tree, with a clean straight trunk; the head ample, and formed of horizontal growing branches, not crowded together, which assume, towards the extremities, a drooping or pendulous direction. The leaves are nearly orbicular, sinuate, or toothed, smooth on both sides; foot-stalks compressed; young branches hairy; stigmas 4, crested and eared at the base. The foliage is of a fine rich green; and the upper surface of the leaves being somewhat darker than the under, a sparkling and peculiar effect is produced by the almost constant tremulous motion with which they are affected by the slightest breath of air, and which is produced by the peculiar form of the foot-stalks, which in this species is flattened, or vertically compressed in relation to the plane of the leaf, causing a quivering or double lateral motion, instead of the usual waving motion, where the foot-stalk is round, or else compressed horizontally.

The Black Poplar, P. nigra, is a tree of the largest size, with an ample head, composed of numerous branches and terminal shoots. The bark is ash-coloured, and becomes rough and deeply furrowed with age. The catkins are bipartite, cylindrical; the barren appear in March or April, long before the expansion, of the leaves, and, being large and of a deep red colour, produce a rich effect at that early period of the year. The capsules or seed-vessels of the fertile catkin are round, and contain a pure white cottony down, in which the seeds are enveloped. The leaves appear about the middle of May, and, when they first expand, their colour is a mixture of red and yellow; afterwards they are of a pale light green, with yellowish foot-stalks; remarkably triangular, acuminate, serrate, smooth on both sides; stigmas 4.

There is a Black Poplar at Alloa House, in Clackmannanshire, which, in 1782, at the height of between three and four feet from the ground, measured thirteen feet and a half in circumference. There is also a very graceful and beautiful tree of the same species at Bury St. Edmunds, ninety feet in height, and which measures, at the distance of three feet from the ground, fifteen feet in girth. The trunk rises forty-five feet before it divides, when it throws out a vast profusion of branches.

The Poplar was dedicated by the Romans to Hercules, in honour of his having destroyed the monster Cacus in a cavern near to the Aventine Mount, where the Poplar formerly flourished in abundance. In Pitt's translation of Virgil, the following reference is made to the rite of crowning with the Poplar:--

From that blest hour th' Arcadian tribe bestowed Those solemn honours on their guardian god. Potitius first, his gratitude to prove, Adored Alcides in the shady grove; And with the old Pinarian sacred line These altars raised, and paid the rites divine,-- Rites, which our sons for ever shall maintain; And ever sacred shall the grove remain. Come, then, with us to great Alcides pray, And crown your heads, and solemnize the day. Invoke our common god with hymns divine, And from the goblet pour the generous wine. He said, and with the Poplar's sacred boughs, Like great Alcides, binds his hoary brows.

The Greek name of Hercules.

THE SCOTCH FIR, OR PINE.

Generic characters. Flowers monoecious. Cones woody, with numerous 2-seeded scales, thickened and angular at the end. Seeds with a crustaceous coat, winged. Leaves acerose, in clusters of from 2 to 5, surrounded by scarious scales at the base.

The Scotch Fir or Pine, and its varieties, are indigenous throughout the greater part of Europe. It also extends into the north, east, and west of Asia; and is found at Nootka Sound in Vancouver's Island, on the north-west coast of North America. In the south of Europe it grows at an elevation of from 1000 to 1500 feet; in the Highlands of Scotland, at 2700 feet; and in Norway and Lapland, at 700 feet. Widely dispersed, however, as the species is throughout the mountainous regions of Europe, it is only found in profusion between 52° and 65° N. lat. It occurs in immense forests in Poland and Russia, as well as in northern Germany, Sweden, Norway, and Lapland, up to the 70° of N. lat. The indigenous forests of Scotland, which formerly occupied so large a portion of its surface, have been greatly reduced within the last sixty years, chiefly on account of the pecuniary embarrassments of their proprietors.

The Scotch Fir, in favourable situations, attains the height of from eighty to one hundred feet, with a trunk from two to four feet in diameter, and a head somewhat conical or rounded, but generally narrow in proportion to its height, as compared with the heads of other broad-leafed trees. The bark is of a reddish tinge, comparatively smooth, scaling off in some varieties, and rough and furrowed in others. The branches are disposed in whorls from two to four together, and sometimes five or six; they are at first slightly turned upwards, but finally become somewhat pendant, with the exception of those branches which form the summit of the tree. The leaves are in sheaths, spirally disposed on the branches; they are distinguished at first sight from all other pines in which the leaves are in pairs, by being much more glaucous, more especially when in a young state, and straighter. The general length of the leaves, in vigorous young trees, is from two to three inches; but in old trees they are much shorter; they are smooth on both surfaces, stiff, obtuse at the extremities, with a small point, and minutely serrated; dark green on the upper side, and glaucous and striated on the under side. The leaves remain green on the tree during four years, and generally drop off at the commencement of the fifth year, Long before this time, generally at the beginning of the second year, they have entirely lost their light glaucous hue, and have become of the dark sombre appearance which is characteristic of this tree at every season except that of summer, when the young glaucous shoots of the year give it a lighter hue. The flowers appear commonly in May and June. The barren flowers are from half an inch to upwards of an inch long, are placed in whorls at the base of the young shoots of the current year, and contain two or more stamens with large yellow anthers, which discharge a sulphur-coloured pollen in great abundance. The fertile flowers, or embryo cones, appear on the summits of the shoots of the current year, generally two on the point of a shoot, but sometimes from four to six. The colour of these embryo cones is generally purple and green; but they are sometimes yellowish or red. It requires eighteen months to mature the cones; and in a state of nature it is two years before the seeds are in a condition to germinate. The cone, which is stalked, and, when mature, begins to open at the narrow extremity, is perfectly conical while closed, rounded at the base, from one to two inches in length, and about an inch across in the broadest part; as it ripens, the colour changes from green to reddish brown. The scales of the cone are oblong, and terminate externally in a kind of depressed pyramid, which varies in shape and height. At the base of each scale, and close to the axis of the cone, two oval-winged seeds or nuts are lodged. From these nuts the young plant appears in the shape of a slender stem, with from five to six linear leaves or cotyledons. In ten years, in the climate of London, plants will attain the height of from twenty-five to thirty feet; and in twenty years, from forty to fifty feet.

The great contempt in which the Scotch Fir is commonly held, says Gilpin, "arises, I believe, from two causes--its dark murky hue is unpleasing, and we rarely see it in a picturesque state. In perfection it is a very picturesque tree, though we have little idea of its beauty. It is a hardy plant, and is therefore put to every servile office. If you wish to screen your house from the south-west wind, plant Scotch Firs; and plant them close and thick. If you want to shelter a nursery of young trees, plant Scotch Firs; and the phrase is, you may afterwards weed them out as you please. I admire its foliage, both for the colour of the leaf, and its mode of growth. Its ramification, too, is irregular and beautiful, and not unlike that of the stone pine; which it resembles also in the easy sweep of its stem, and likewise in the colour of the bark, which is commonly, as it attains age, of a rich reddish brown. The Scotch Fir, indeed, in its stripling state, is less an object of beauty. Its pointed and spiry shoots, during the first years of its growth, are formal; and yet I have sometimes seen a good contrast produced between its spiry points and the round-headed oaks and elms in its neighbourhood. When I speak, however, of the Scotch Fir as a beautiful individual, I conceive it when it has outgrown all the improprieties of its youth; when it has completed its full age, and when, like Ezekiel's cedar, it has formed its head high among the thick branches. I may be singular in my attachment to the Scotch Fir. I know it has many enemies; but my opinion will weigh only with the reasons I have given." Sir Thomas Dick Lauder, in his commentary on this passage, says, "We agree with Gilpin to the fullest extent in his approbation of the Scotch Fir as a picturesque tree. We, for our part, confess, that we have seen it towering in full majesty, in the midst of some appropriate Highland scene, and sending its limbs abroad with all the unconstrained freedom of a hardy mountaineer, as if it claimed dominion over the savage regions around it; we have then looked upon it as a very sublime object. People who have not seen it in its native climate and soil, and who judge of it from the wretched abortions which are swaddled and suffocated in English plantations, in deep, heavy, and eternally wet clays, may well call it a wretched tree; but, when its foot is among its own Highland heather, and when it stands freely on its native knoll of dry gravel, or thinly covered rock, over which its roots wander afar in the wildest reticulation, whilst its tall, furrowed, and often gracefully sweeping red and gray trunk, of enormous circumference, rears aloft its high umbrageous canopy, then would the greatest sceptic on this point be compelled to prostrate his mind before it with a veneration which, perhaps, was never before excited in him by any other tree."

Some of the most picturesque trees of this kind, perhaps, in England, adorn Mr. Lenthall's mansion, of Basilsleigh, in Berkshire. The soil is a deep rich sand, which seems to be well adapted to them. As they are here at perfect liberty, they not only become large and noble trees, but they expand themselves likewise in all the careless forms of nature.

There is a remarkably fine specimen of the Scotch Fir at Castle Huntly, in Perthshire. In 1796, it measured thirteen feet six inches in girth, at three feet from the ground; and close to the ground, it measured nineteen feet, and is thought not unlikely to be the largest planted Fir in the country. The word planted is very properly used here, as many examples of larger natural Firs have been produced. Professor Walker observes, that few Fir-trees were planted before the beginning of the present century; and that as the Fir is a tree which, from the number of rings found in it, will probably grow four hundred years, it is impossible that the planted Firs can have arrived at perfection. "This," says Sir T. Lauder, "may be all true; but as the reasoning proceeds upon the fact of a natural Swedish tree, perfectly sound, having three hundred and sixty circles in it, it by no means follows that a planted Fir will not rot in a premature state of disease, and die before it has sixty circles."

The acerose or needle leaf of the Pine seems necessary to protect the tree from injury; for if their leaves were of a broader form, the branches would be borne down, in winter, by the weight of snow in the northern latitudes, and they would be more liable to be uprooted by the mighty hurricane. It is, however, enabled thus to evade both; as the snow falls through, and the winds penetrate between, the interstices of its filiform leaf. Struggling through the branches, the wind comes in contact with such an innumerable quantity of points and edges, as, even when gentle, to produce a deep murmur, or sighing; but when the breeze is strong, or the storm is raging abroad, it produces sounds like the murmuring of the ocean, or the beating of the surge and billows among the rocks:--

The loud wind through the forest wakes With sounds like ocean roaring, wild and deep, And in yon gloomy Pines strange music makes, like symphonies unearthly heard in sleep; The sobbing waters wash their waves and weep: Where moans the blast its dreary path along, The bending Firs a mournful cadence keep, And mountain rocks re-echo to the song, As fitful raves the wind the hills and woods among.

Drummond.

Wordsworth, also, thus speaks of Pine-trees moved by a gentle breeze:--

An idle voice the Sabbath region fills Of deep that calls to deep across the hills, Broke only by the melancholy sound Of drowsy bells for ever tinkling round; Faint wail of eagle melting into blue Beneath the cliffs, and Pine-wood's steady sugh.

The quality of the timber of the Scotch Fir, according to some, is altogether dependent on soil, climate, and slowness of growth; but, according to others, it depends jointly on these circumstances, and on the kind of variety cultivated. It is acknowledged that the timber of the Scotch Fir, grown on rocky surfaces, or where the soil is dry and sandy, is generally more resinous and redder in colour, than that of such as grow on soils of a clayey nature, boggy, or on chalk. At what time the sap wood is transformed into durable or red wood, has not yet been determined by vegetable physiologists. The durability of the red timber of this tree was supposed by Brindley, the celebrated engineer, to be as great as that of the oak; and some of it, grown in the north Highlands, is reported to have been as fresh and full of resin after having been three hundred years in the roof of an old castle, as newly-imported timber from Memel.

The red wood timber of the Scottish forests, similar, in every respect, to the best Baltic Pine, is the produce of trees that have numbered from one to two or more centuries. In Norway, it is not considered full-grown timber till it has reached from one hundred and thirty to two hundred years. It seems, then, rather preposterous, that any one should expect that plantation Fir timber, cut down when, perhaps, not more than thirty years old, and consisting entirely of sap wood, should be adapted to all those purposes which require the best full-grown and matured timber; and yet such seems very generally to have been the case, and to the disappointment at not finding those expectations realized, may be attributed a large portion of that prejudice and dislike so generally entertained towards this tree.

On Hampstead Heath, near London, there are a number of Pines which are said to have been raised from seed brought from Ravenna. If so, the cones are very different from those of the Ravenna Pine described by Leigh Hunt:--

Various the trees and passing foliage there,-- Wild pear, and oak, and dusky juniper, With bryony between in trails of white, And ivy, and the suckle's streaky light, And moss warm gleaming with a sudden mark, Like flings of sunshine left upon the bark; And still the Pine long-haired, and dark, and tall, In lordly right, predominant o'er all.

Much they admire that old religious tree, With shaft above the rest up-shooting free, And shaking, when its dark locks feel the wind, Its wealthy fruit with rough Mosaic rind.

THE SILVER FIR.