In Europe, and in the Latin languages, there is a distinction, and a universally accepted one, between education and instruction. It is something like that which I am trying to make clear between Civilization and Progress. An 'instructed man' means a man who has learned much but who may have no manners at all, may eat with his knife, forget to wash his hands, wear outlandish clothes, and be ignorant even of the ordinary forms of politeness. An 'educated person,' on the contrary, may know very little Latin, and no Greek, and may be shaky in the multiplication table; but he must have perfect manners to deserve the designation, and tact, with a thorough knowledge of all those customs and outward forms which distinguish what calls itself civilized society from the rest of the world. Anyone can see that such instruction, on the one hand, and such education, on the other, are derived from wholly different sources, and must lead to wholly different results; and it is as common nowadays to find men who have the one without the other, as it ever was in ancient Greece or Rome. I should like to assert that it is more common, since Progress is so often mistaken for Civilization and tacitly supposed to be able to do without it, and that Diogenes would not be such a startling exception now as he was in the days of Alexander the Great. But no one would dare to say that Progress cannot go on in a high state of Civilization. All that can be stated with absolute certainty is that they are independent of each other, since Progress means 'going on' and therefore 'change'; whereas Civilization may remain at the same high level for a very long period, without any change at all. Compare our own country with China, for instance. In the arts—the plural 'arts'—in applied science, we are centuries ahead of Asia; but our manners are rough and even brutal compared with the elaborate politeness of the Chinese, and we should labour in vain to imitate the marvellous productions of their art. We may prefer our art to that of the far East, though there are many critics who place the Japanese artists much higher than our own; but no one can deny the superior skill of the Asiatics in the making of everything artistic.
Nor must we undervalue in art the importance of the minor and special sort of progress which means a real and useful improvement in methods and materials. That is doubtless a part, a first step, in the general progress which tends ultimately to the invention of machinery, but which, in its development, passes through the highest perfection of manual work.
The first effect of this sort of progress in art was to give men of genius new and better tools, and therefore a better means of expression. In a way, almost every painter of early times was an inventor, and had to be, because for a long time the methods and tools of painting were absurdly insufficient. Every man who succeeded had discovered some new way of grinding and mixing colours, of preparing the surface on which he worked, of using the brush and the knife, and of fixing the finished picture by means of varnishes. The question of what painters call the vehicle for colour was always of immense importance. Long before Giotto began to work there seem to have been two common ways of painting, namely, in fresco, with water-colours, and on prepared surfaces by means of wax mixed with some sort of oil.
In fresco painting, the mason, or the plasterer, works with the painter. A surface as large as the artist expects to use during a few hours is covered with fresh stucco by the mason, and thoroughly smoothed with a small trowel. Stucco, as used in Italy, is a mixture of slaked lime and white marble dust, or very fine sand which has been thoroughly sifted. If stained to resemble coloured or veined marbles, and immediately ironed till it is dry with hot smooth irons, the surface of the mass is hardened and polished to such a degree that it is almost impossible to distinguish it from real marble without breaking into it. Waxing gives it a still higher polish. But if water-colours are used for painting a picture upon it, and if the colours are laid on while the stucco is still damp, they unite with the lime, and slowly dry to a surface which is durable, but neither so hard nor so polished as that produced when the stucco is ironed. The principal conditions are that the stucco must be moist, the wall behind it absolutely dry and the colours very thin and flowing. Should the artist not cover all that has been prepared for his day's work, the remainder has to be broken out again and laid on fresh the next day. It is now admitted that the wall-paintings of the ancients were executed in this way. As it was impossible for the artist at any time to have the whole surface of the freshly stuccoed wall at his disposal in order to draw his picture before painting it, he either drew the design in red upon the rough dry plaster, and then had the stucco laid over it in bits, or else he made a cartoon drawing of the work in its full size. The outlines were then generally pricked out with a stout pin, and the cartoon cut up into pieces of convenient dimensions, so that the painter could lay them against the fresh stucco and rub the design through, or pounce it, as we should say, with charcoal dust, like a stencil. He then coloured it as quickly as he could. If he made a mistake, or was not pleased with the effect, there was no remedy except the radical one of breaking off the stucco, laying it on fresh, and beginning over again. It was clearly impossible to paint over the same surface again and again as can be done in oil painting.
No one knows exactly when eggs were first used in fresco painting, nor does it matter much. Some people used the yolk and the white together, some only one or the other, but the egg was, and is, always mixed with water. Some artists now put gum tragacanth into the mixture. It is then used like water in water-colour work, but is called 'tempera' or 'distemper.' The effect of the egg is to produce an easy flow of the colour with so little liquid that the paint does not run on the surface, as it easily does in ordinary water-colours. The effect of the yellow yolk of the egg upon the tints is insignificant, unless too much be used. By using egg, one may paint upon ordinary prepared canvas as easily as with oils, which is impossible with water-colour.
As for the early paintings upon panels of wood, before oils were used, they were meant to be portable imitations of fresco. The wood was accordingly prepared by covering it with a thin coating of fine white cement, or stucco, which was allowed to dry and become perfectly hard, because it was of course impossible to lay it on fresh every day in such small quantities. The vehicle used could therefore not be water, which would have made the colours run. The most common practice of the Byzantine and Romanesque schools seems to have been to use warm melted wax in combination with some kind of oil, the mixture being kept ready at hand over a lighted lamp, or on a pan of burning charcoal. There are artists in Europe, still, who occasionally use wax in this way, though generally mixed with alcohol or turpentine, and the result is said to be very durable. Sir Joshua Reynolds painted many pictures in this way.
With regard to using oils on a dry surface in wall painting, instead of fresco, Lionardo da Vinci tried it repeatedly with the result that many of his wall paintings were completely lost within thirty or forty years after they had been painted. The greatest of those which have survived at all, the Last Supper in Milan, has had to be restored so often that little of the original picture remains untouched.
The enormous value of linseed oil and nut oil as a vehicle was apparent as soon as it was discovered in Holland. Its great advantages are that, unlike water or egg, it will carry a large quantity of colour upon the canvas at the first stroke, that it dries slowly, so that the same ground may be worked over without haste while it is still fresh, and that it has a very small effect in changing the tints of the original paints used. One may see what value was attached to its use from the fact that those who first brought it to Italy worked in secret. Andrea Castagno, surnamed the Assassin, learned the method from his best friend, Domenico Veneziano, and then murdered him while he was singing a serenade under a lady's window, in order to possess the secret alone. But it soon became universally known and made a revolution in Italian painting.
In the older times, when rare and valuable pigments were used, as well as large quantities of pure gold, the materials to be employed and their value were stipulated for in the contract made between the painter and his employer before the picture was begun, and an artist's remuneration at that time was much of the nature of a salary, calculated on an approximate guess at the time he might need for the work. That was, of course, a survival from the time of the Byzantine artists, to whom gold and silver and paints were weighed out by the ecclesiastics for whom they painted, and had to be accounted for in the finished picture. There is a story told of an artist's apprentice, who made a considerable sum of money by selling the washings of his master's brushes when the latter was using a great quantity of ultramarine; and that shows the costliness of mere paints at that time. As for the more valuable materials, the great altar picture in Saint Mark's, in Venice, is entirely composed of plates of pure gold enamelled in different colours, and fastened in a sort of mosaic upon the wood panel as required, the lights and shades being produced by hatching regular lines through the hard enamel with a sharp instrument. The whole technical history of painting lies between that sort of work and the modern painter's studio.
Before oil painting became general, artists were largely dependent on commissions in order to do any work except drawing. Fresco needed a wall, and work done in that manner could not be removed from place to place. The old-fashioned panel work with its gold background was so expensive that few artists could afford to paint pictures on the mere chance of selling them. But the facilities and the economy of pure tempera work, and work in oils, soon made easel pictures common.