101. But if these evils now continue, it can only be through rashness which no example can warn, or through apathy which no hope can stimulate, for Mr. Eastlake has alike withdrawn license from experimentalism and apology from indolence. He has done away with all legends of forgotten secrets; he has shown that the masters of the great Flemish and early Venetian schools possessed no means, followed no methods, but such as we may still obtain and pursue; but he has shown also, among all these masters, the most admirable care in the preparation of materials and the most simple consistency in their use; he has shown that their excellence was reached, and could only have been reached, by stern and exact science, condescending to the observance, care, and conquest of the most minute physical particulars and hindrances; that the greatest of them never despised an aid nor avoided a difficulty. The loss of imaginative liberty sometimes involved in a too scrupulous attention to methods of execution is trivial compared to the evils resulting from a careless or inefficient practice. The modes in which, with every great painter, realization falls short of conception are necessarily so many and so grievous, that he can ill afford to undergo the additional discouragement caused by uncertain methods and bad materials. Not only so, but even the choice of subjects, the amount of completion attempted, nay, even the modes of conception and measure of truth are in no small degree involved in the great question of materials. On the habitual use of a light or dark ground may depend the painter's preference of a broad and faithful, or partial and scenic chiaroscuro; correspondent with the facility or fatality of alterations, may be the exercise of indolent fancy, or disciplined invention; and to the complexities of a system requiring time, patience, and succession of process, may be owing the conversion of the ready draughtsman into the resolute painter. Farther than this, who shall say how unconquerable a barrier to all self-denying effort may exist in the consciousness that the best that is accomplished can last but a few years, and that the painter's travail must perish with his life?
102. It cannot have been without strong sense of this, the true dignity and relation of his subject, that Mr. Eastlake has gone through a toil far more irksome, far less selfish than any he could have undergone in the practice of his art. The value which we attach to the volume depends, however, rather on its preceptive than its antiquarian character. As objects of historical inquiry merely, we cannot conceive any questions less interesting than those relating to mechanical operations generally, nor any honors less worthy of prolonged dispute than those which are grounded merely on the invention or amelioration of processes and pigments. The subject can only become historically interesting when the means ascertained to have been employed at any period are considered in their operation upon or procession from the artistical aim of such period, the character of its chosen subjects, and the effects proposed in their treatment upon the national mind. Mr. Eastlake has as yet refused himself the indulgence of such speculation; his book is no more than its modest title expresses. For ourselves, however, without venturing in the slightest degree to anticipate the expression of his ulterior views—though we believe that we can trace their extent and direction in a few suggestive sentences, as pregnant as they are unobtrusive—we must yet, in giving a rapid sketch of the facts established, assume the privilege of directing the reader to one or two of their most obvious consequences, and, like honest 'prentices, not suffer the abstracted retirement of our master in the back parlor to diminish the just recommendation of his wares to the passers-by.
103. Eminently deficient in works representative of the earliest and purest tendencies of art, our National Gallery nevertheless affords a characteristic and sufficient series of examples of the practice of the various schools of painting, after oil had been finally substituted for the less manageable glutinous vehicles which, under the general name of tempera, were principally employed in the production of easel pictures up to the middle of the fifteenth century. If the reader were to make the circuit of this collection for the purpose of determining which picture represented with least disputable fidelity the first intention of its painter, and united in its modes of execution the highest reach of achievement with the strongest assurance of durability, we believe that—after hesitating long over hypothetical degrees of blackened shadow and yellowed light, of lost outline and buried detail, of chilled luster, dimmed transparency, altered color, and weakened force—he would finally pause before a small picture on panel, representing two quaintly dressed figures in a dimly lighted room—dependent for its interest little on expression, and less on treatment—but eminently remarkable for reality of substance, vacuity of space, and vigor of quiet color; nor less for an elaborate finish, united with energetic freshness, which seem to show that time has been much concerned in its production, and has had no power over its fate.
104. We do not say that the total force of the material is exhibited in this picture, or even that it in any degree possesses the lusciousness and fullness which are among the chief charms of oil-painting; but that upon the whole it would be selected as uniting imperishable firmness with exquisite delicacy; as approaching more unaffectedly and more closely than any other work to the simple truths of natural color and space; and as exhibiting, even in its quaint and minute treatment, conquest over many of the difficulties which the boldest practice of art involves.
This picture, bearing the inscription "Johannes Van Eyck (fuit?) hic, 1434," is probably the portrait, certainly the work, of one of those brothers to whose ingenuity the first invention of the art of oil-painting has been long ascribed. The volume before us is occupied chiefly in determining the real extent of the improvements they introduced, in examining the processes they employed, and in tracing the modifications of those processes adopted by later Flemings, especially Rubens, Rembrandt, and Vandyck. Incidental notices of the Italian system occur, so far as, in its earlier stages, it corresponded with that of the north; but the consideration of its separate character is reserved for a following volume, and though we shall expect with interest this concluding portion of the treatise, we believe that, in the present condition of the English school, the choice of the methods of Van Eyck, Bellini, or Rubens, is as much as we could modestly ask or prudently desire.
105. It would have been strange indeed if a technical perfection like that of the picture above described (equally characteristic of all the works of those brothers), had been at once reached by the first inventors of the art. So far was this from being the case, and so distinct is the evidence of the practice of oil-painting in antecedent periods, that of late years the discoveries of the Van Eycks have not unfrequently been treated as entirely fabulous; and Raspe, in particular, rests their claims to gratitude on the contingent introduction of amber-varnish and poppy-oil:—"Such perhaps," he says, "might have been the misrepresented discovery of the Van Eycks." That tradition, however, for which the great painters of Italy, and their sufficiently vain historian, had so much respect as never to put forward any claim in opposition to it, is not to be clouded by incautious suspicion. Mr. Eastlake has approached it with more reverence, stripped it of its exaggeration, and shown the foundations for it in the fact that the Van Eycks, though they did not create the art, yet were the first to enable it for its function; that having found it in servile office and with dormant power—laid like the dead Adonis on his lettuce-bed—they gave it vitality and dominion. And fortunate it is for those who look for another such reanimation, that the method of the Van Eycks was not altogether their own discovery. Had it been so, that method might still have remained a subject of conjecture; but after being put in possession of the principles commonly acknowledged before their time, it is comparatively easy to trace the direction of their inquiry and the nature of their improvements.
106. With respect to remote periods of antiquity, we believe that the use of a hydrofuge oil-varnish for the protection of works in tempera, the only fact insisted upon by Mr. Eastlake, is also the only one which the labor of innumerable ingenious writers has established: nor up to the beginning of the twelfth century is there proof of any practice of painting except in tempera, encaustic (wax applied by the aid of heat), and fresco. Subsequent to that period, notices of works executed in solid color mixed with oil are frequent, but all that can be proved respecting earlier times is a gradually increasing acquaintance with the different kinds of oil and the modes of their adaptation to artistical uses.
Several drying oils are mentioned by the writers of the first three centuries of the Christian era—walnut by Pliny and Galen, walnut, poppy, and castor-oil (afterwards used by the painters of the twelfth century as a varnish) by Dioscorides—yet these notices occur only with reference to medicinal or culinary purposes. But at length a drying oil is mentioned in connection with works of art by Aetius, a medical writer of the fifth century. His words are:—
"Walnut oil is prepared like that of almonds, either by pounding or pressing the nuts, or by throwing them, after they have been bruised, into boiling water. The (medicinal) uses are the same: but it has a use besides these, being employed by gilders or encaustic painters; for it dries, and preserves gildings and encaustic paintings for a long time."