[Illustration: On the Bayou Têche; Study for Values.]
A window is, when considered as a work of fine art in color, a translucent composition, there being no part of it which can appeal to the eye by other than transmitted light. The artist has, then, the need of something strong to lean upon, some background, some _fond_ upon which to relieve his more brilliant pieces of translucency; for it can be easily understood that color composition which is wholly translucent will tend toward feebleness, toward paleness, toward a certain evanescent and doubtful character of its colors, from which it must be saved. This needed background was found in the use of the leads; that is to say, of those strips of lead made generally in the form of a capital I, in which the edges of the separate pieces of glass are held. By taking these leads as the artistic sub-structure of the composition, by placing them where needed, and by cutting the glass accordingly, by combining the colors of the glass in such a way as to allow the leads to be put where they were needed for this purpose of background, results were obtained which no artist in glass had ever yet attempted. La Farge's use of leads, in this way, remains peculiarly his own in the subtlety and refinement of the linear design. Occasionally, indeed, a certain amount of opaque painting, of that solid non-translucent painting which the men of the Middle Ages used continually, has been used to increase the area of his lead sash-bars or to diminish the brilliancy of a background. All artists recognize the need of the _repentir_, of the amendment made after the work is partly done, or even, to all eyes but their own, completed; and painting in opaque color has been used by La Farge when it has appeared that the lead-sash was not quite sufficient for the background needed. In like manner, painting in translucent colored enamels has been used by him where it has appeared to him that no glass available would produce the tone desired. As such instances are occasional and rare, these devices are not a part of the essence of La Farge's work in glass, and they are mentioned here merely because their existence must be understood as accidental. The treatment of heads and hands and other necessarily nude parts of the body, in order that these surfaces may harmonize with the generally unpainted drapery and background, would require pages of discussion if entered upon at all.