1869.] Stained Glass from the Old Authorities. 587 color, being thus put away, must be permitted to rest two days more, after which it is to be poured out, as at first. This last color is to be placed upon a piece of glass a little hollowed ; and the whole, laid on some sand in a common earthen vessel, is to be set on the lire to dry slowly, and to preserve it. When it is intended to be used, a drop of clear water is to be poured on a piece of glass, with which as much color, as is necessary, is to be tempered. This color serves for the carnations ; for, as to that which is the thickest, and remains at the bottom of the glass, it is only fit to make some tints for wood and dra- peries. Green is produced from ass ustum, or copper burnt, one ounce ; white sand, or silicious earth, four ounces ; and red lead, one ounce. The whole, after being- ground together in a mortar of bronze, is to be put into a fire of live coal in a covered crucible for about an hour, and then taken out. When cool it is to be ground dry in the same mortar ; and then, adding to it one-fourth part of saltpetre, it is to be again placed in the fire, in the same crucible, for two hours. It is next to be taken out and ground, as before; and adding to it again a sixth part of saltpetre, it is to be replaced in the fire for the third time, and to be left for two hours and a half, or thereabouts. After this, the color, hot as it is, is to be taken out of the crucible with an iron instrument ; for it is tenacious, and dif- ficult to get out. It is a good method to lute the crucibles, because few are found sufficiently strong to resist the force of the fire necessary for these cal- cinations. Blue, purple, and violet are produced in the same manner as green, only changing the scales of copper for other materials ; as, for instance, to make blue, we must take zaffre ; for purple, we need manganese ; and for violet we require zaffre and manganese in equal propor- tions. The other materials, in each of these cases, must be the same, as in the case of green. Yellow rocaille demands three ounces of red lead and one ounce of sand, or silicious earth, which must be calcined, as has been said. For green rocaille only one ounce of red lead and turee ounces of sand are necessary. The tints proper for carnations are made with harderic, or iron ore, and as much rocaille: after having pounded them together, they are to be ground on the basin. The color for hair, for trunks of trees, and other, things of a like kind, is pro- duced from harderic and scales of iron, an equal quantity, and of rocaille as much as of both the others. The whole is to be ground together, and this will make a yellowish red. So far our old authority, to whom w0 shall shortly recur. Stained Glass is so well adapted to the pre-entation of heraldic subjects, that, in its gorgeous transparency, we should be glad to see blazoned the en- tire range of arms belonging to the United States, in some grand and spa- cious hall consecrated to patriotic use. In the great window at one end should appear the National Arms, in that at the other, in an upper compartment, the National Flag ; in a lower compartment the Arms of Pennsylvania, as possess- ing Independence Hall, the Birthplace of the Nation. Six large windows on each side, should be occupied with the arms of the other twelve original States, and those of the admitted States should be well and amply provided for in other piercings of the walls. As badges, the National Shield, the .American Eagle, the Olive Branch, the Arrows, the Stars, the Revenue Flag, the Union Jack, and sundry variations of the Shield could be introduced very appropriately. Well managed, it is impossible to conceive a finer effect than this would have upon the pa'riotic mind.
