The Romans invented no new principle in architecture, unless it be the arch, which was known, though not practically applied, by the Assyrians, Egyptians, and Greeks. The Romans were a practical and utilitarian people, and needed for their various structures greater economy of material than was compatible with large blocks of stone, especially for such as were carried to great altitudes. The arch supplied this want, and is perhaps the greatest invention ever made in architecture. No instance of its adoption occurs in the construction of Greek edifices before Greece became a part of the Roman empire. Its application dates back to the Cloaca Maxima, and may have been of Etrurian invention. Some maintain that Archimedes of Sicily was the inventor of the arch; but to whomsoever the glory of the invention is due, it is certain that the Romans were the first of European nations to make a practical application of its wonderful qualities. It enabled them to rear vast edifices with the humblest materials, to build bridges, aqueducts, sewers, amphitheatres, and triumphal arches, as well as temples and palaces. The merits of the arch have never been lost sight of by succeeding generations, and it is an essential element in the magnificent Gothic cathedrals of the Middle Ages. Its application extends to domes and cupolas, to floors and corridors and roofs, and to various other parts of buildings where economy of material and labor is desired. It was applied extensively to doorways and windows, and is an ornament as well as a utility. The most imposing forms of Roman architecture may be traced to a knowledge of the properties of the arch, and as brick was more extensively used than any other material, the arch was invaluable. The imperial palace on Mount Palatine, the Pantheon (except its portico and internal columns), the temples of Peace, of Venus and Rome, and of Minerva Medica, were of brick. So were the great baths of Titus, Caracalla, and Diocletian, the villa of Hadrian, the city walls, the villa of Mecaenas at Tivoli, and most of the palaces of the nobility,--although, like many of the temples, they were faced with stone. The Colosseum was of travertine, a cheap white limestone, and faced with marble. It was another custom to stucco the surface of brick walls, as favorable to decorations. In consequence of the invention of the arch, the Romans erected a greater variety of fine structures than either the Greeks or Egyptians, whose public edifices were chiefly confined to temples. The arch entered into almost every structure, public or private, and superseded the use of long stone-beams, which were necessary in the Grecian temples, as also of wooden timbers, in the use of which the Romans were not skilled, and which do not really pertain to architecture: an imposing edifice must always be constructed of stone or brick. The arch also enabled the Romans to economize in the use of costly marbles, of which they were very fond, as well as of other stones. Some of the finest columns were made of Egyptian granite, very highly polished.

The extensive application of the arch doubtless led to the deterioration of the Grecian architecture, since it blended columns with arcades, and thus impaired the harmony which so peculiarly marked the temples of Athens and Corinth; and as taste became vitiated with the decline of the empire, monstrous combinations took place, which were a great fall from the simplicity of the Parthenon and the interior of the Pantheon.

But whatever defects marked the age of Diocletian and Constantine, it can never be questioned that the Romans carried architecture to a perfection rarely attained in our times. They may not have equalled the severe simplicity of their teachers the Greeks, but they surpassed them in the richness of their decorations, and in all buildings designed for utility, especially in private houses and baths and theatres.

The Romans do not seem to have used other than semicircular arches. The Gothic, or Pointed, or Christian architecture, as it has been variously called, was the creation of the Middle Ages, and arose almost simultaneously in Europe after the first Crusade, so that it would seem to be of Eastern origin. But it was a graft on the old Roman arch, in the curve of the ellipse rather than the circle.

Aside from this invention of the arch, to which we are indebted for the most beautiful ecclesiastical structures ever erected, we owe everything in architecture to the Greeks and Romans. We have found out no new principles which were not known to Vitruvius. No one man was the inventor or creator of the wonderful structures which ornamented the cities of the ancient world. We have the names of great architects, who reared various and faultless models, but they all worked upon the same principles, and these can never be subverted; so that in architecture the ancients are our schoolmasters, whose genius we revere the more we are acquainted with their works. What more beautiful than one of those grand temples which the cultivated heathen Greeks erected to the worship of their unknown gods!--the graduated and receding stylobate as a base for the fluted columns, rising at regular distances in all their severe proportion and matchless harmony, with their richly carved capitals supporting an entablature of heavy stones, most elaborately moulded and ornamented with the figures of plants and animals; and rising above this, on the ends of the temple, or over a portico several columns deep, the pediment, covered with chiselled cornices, with still richer ornaments rising from the apices and at the feet, all carved in white marble, and then spread over an area larger than any modern churches, making a forest of columns to bear aloft those ponderous beams of stone, without anything tending to break the continuity of horizontal lines, by which the harmony and simplicity of the whole are regulated! So accurately squared and nicely adjusted were the stones and pillars of which these temples were composed, that there was scarcely need even of cement. Without noise or confusion or sound of hammers did those temples rise, since all their parts were cut and carved in the distant quarries, and with mathematical precision. And within the cella, nearly concealed by surrounding columns, were the statues of the gods, and the altars on which incense was offered, or sacrifices made. In every part, interior and exterior, do we see a matchless proportion and beauty, whether in the shaft or the capital or the frieze or the pilaster or the pediment or the cornices, or even the mouldings,--everywhere grace and harmony, which grow upon the mind the more they are contemplated. The greatest evidence of the matchless creative genius displayed in those architectural wonders is that after two thousand years, and with all the inventions of Roman and modern artists, no improvement has been made; and those edifices which are the admiration of our own times are deemed beautiful as they approximate the ancient models, which will forever remain objects of imitation. No science can make two and two other than four; no art can make a Doric temple different from the Parthenon without departing from the settled principles of beauty and proportion which all ages have indorsed. Such were the Greeks and Romans in an art which is one of the greatest indices of material civilization, and which by them was derived from geometrical forms, or the imitation of Nature.

The genius displayed by the ancients in sculpture is even more remarkable than their skill in architecture. Sculpture was carried to perfection only by the Greeks; but they did not originate the art, since we read of sculptured images from the remotest antiquity. The earliest names of sculptors are furnished by the Old Testament. Assyria and Egypt are full of relics to show how early this art was cultivated. It was not carried to perfection as early, probably, as architecture; but rude images of gods, carved in wood, are as old as the history of idolatry. The history of sculpture is in fact identified with that of idols. The Egyptians were probably the first who made any considerable advances in the execution of statues. Those which remain are rude, simple, uniform, without beauty or grace (except a certain serenity of facial expression which seems to pervade all their portraiture), but colossal and grand. Nearly two thousand years before Christ the walls of Thebes were ornamented with sculptured figures, even as the gates of Babylon were made of sculptured bronze. The dimensions of Egyptian colossal figures surpass those of any other nation. The sitting statues of Memnon at Thebes are fifty feet in height, and the Sphinx is twenty-five,--all of granite. The number of colossal statues was almost incredible. The sculptures found among the ruins of Karnak must have been made nearly four thousand years ago. They exhibit great simplicity of design, but have not much variety of expression. They are generally carved from the hardest stones, and finished so nicely that we infer that the Egyptians were acquainted with the art of hardening metals for their tools to a degree not known in our times. But we see no ideal grandeur among any of the remains of Egyptian sculpture; however symmetrical or colossal, there is no diversity of expression, no trace of emotion, no intellectual force,--everything is calm, impassive, imperturbable. It was not until sculpture came into the hands of the Greeks that any remarkable excellence in grace of form or expression of face was reached. But the progress of development was slow. The earliest carvings were rude wooden images of the gods, and more than a thousand years elapsed before the great masters were produced whose works marked the age of Pericles.

It is not my object to give a history of the development of the plastic art, but to show the great excellence it attained in the hands of immortal sculptors.

The Greeks had an intuitive perception of the beautiful, and to this great national trait we ascribe the wonderful progress which sculpture made. Nature was most carefully studied by the Greek artists, and that which was most beautiful in Nature became the object of their imitation. They even attained to an ideal excellence, since they combined in a single statue what could not be found in a single individual,--as Zeuxis is said to have studied the beautiful forms of seven virgins of Crotona in order to paint his famous picture of Venus. Great as was the beauty of Phryne or Aspasia or Lais, yet no one of them could have served for a perfect model; and it required a great sensibility to beauty in order to select and idealize what was most perfect in the human figure. Beauty was adored in Greece, and every means were used to perfect it, especially beauty of form, which is the characteristic excellence of Grecian statuary. The gymnasia were universally frequented; and the great prizes of the games, bestowed for feats of strength and agility, were regarded as the highest honors which men could receive,--the subject of the poet's ode and the people's admiration. Statues of the victors perpetuated their fame and improved the sculptor's art. From the study of these statues were produced those great creations which all subsequent ages have admired; and from the application of the principles seen in these forms we owe the perpetuation of the ideas of grace and beauty such as no other people besides the Greeks had ever discovered, or indeed scarcely appreciated. The sculpture of the human figure became a noble object of ambition in Greece, and was most munificently rewarded. Great artists arose, whose works adorned the temples of Greece so long as she preserved her independence, and when that was lost, her priceless productions were scattered over Asia and Europe. The Romans especially seized what was most prized, whether or not they could tell what was most perfect. Greece lived in her marble statues more than in her government or laws; and when we remember the estimation in which sculpture was held among the Greeks, the great prices paid for masterpieces, the care and attention with which they were guarded and preserved, and the innumerable works which were produced, filling all the public buildings, especially consecrated places, and even open spaces and the houses of the rich and great, calling from all classes admiration and praise,--we cannot think it likely that so great perfection will ever be reached again in those figures which are designed to represent beauty of form. Even the comparatively few statues which have survived the wars and violence of two thousand years, convince us that the moderns can only imitate; they can produce no creations equal to those by Athenian artists. "No mechanical copying of Greek statues, however skilful the copyist, can ever secure for modern sculpture the same noble and effective character it possessed among the Greeks, for the simple reason that the imitation, close as may be the resemblance, is but the result of the eye and hand, while the original is the expression of a true and deeply felt sentiment. Art was not sustained by the patronage of a few who affect to have what is called taste; in Greece the artist, having a common feeling for the beautiful with his countrymen, produced his works for the public, which were erected in places of honor and dedicated in temples of the gods."

It was not until the Persian wars awakened among the Greeks the slumbering consciousness of national power, and Athens became the central point of Grecian civilization, that sculpture, like architecture and painting, reached its culminating point of excellence under Phidias and his contemporaries. Great artists had previously made themselves famous, like Miron, Polycletus, and Ageladas; but the great riches which flowed into Athens at this time gave a peculiar stimulus to art, especially under the encouragement of such a ruler as Pericles, whose age was the golden era of Grecian history.

Pheidias, or Phidias, was to sculpture what Aeschylus was to tragic poetry,--the representative of the sublime and grand. He was born four hundred and eighty-four years before Christ, and was the pupil of Ageladas. He stands at the head of the ancient sculptors, not from what we know of him, for his masterpieces have perished, but from the estimation in which he was held by the greatest critics of antiquity. It was to him that Pericles intrusted the adornment of the Parthenon, and the numerous and beautiful sculptures of the frieze and the pediment were the work of artists whom he directed. His great work in that wonderful edifice was the statue of the goddess Minerva herself, made of gold and ivory, forty feet in height, standing victorious, with a spear in her left hand and an image of victory in her right, with helmet on her head, and her shield resting by her side. The cost of this statue may be estimated when we consider that the gold alone used upon it was valued at forty-four talents, equal to five hundred thousand dollars of our money,--an immense sum in that age. Some critics suppose that this statue was overloaded with ornament, but all antiquity was unanimous in its admiration. The exactness and finish of detail were as remarkable as the grandeur of the proportions. Another of the famous works of Phidias was a colossal bronze statue of Athene Promachos, sixty feet in height, on the Acropolis between the Propylaea and the Parthenon. But both of these yielded to the colossal statue of Zeus in his great temple at Olympia, represented in a sitting posture, forty feet high, on a pedestal of twenty feet. The god was seated on a throne. Ebony, gold, ivory, and precious stones formed, with a multitude of sculptured and painted figures, the wonderful composition of this throne. In this his greatest work the artist sought to embody the idea of majesty and repose,--of a supreme deity no longer engaged in war with Titans and Giants, but enthroned as a conqueror, ruling with a nod the subject world, and giving his blessing to those victories which gave glory to the Greeks. So famous was this statue, which was regarded as the masterpiece of Grecian art, that it was considered a calamity to die without having seen it; and this served for a model for all subsequent representations of majesty and power in repose among the ancients. It was removed to Constantinople by Theodosius I., and was destroyed by fire in the year 475 A.D. Phidias executed various other famous works, which have perished; but even those that were executed under his superintendence which have come down to our times,--like the statues which ornamented the pediment of the Parthenon,--are among the finest specimens of art that exist, and exhibit the most graceful and appropriate forms which could have been selected, uniting grandeur with simplicity, and beauty with accuracy of anatomical structure. His distinguishing excellence was ideal beauty, and that of the sublimest order.