1643. Leaf Impressions.—Hold oiled paper in the smoke of a lamp, or of pitch, until it becomes coated with the smoke; to this paper apply the leaf of which you wish an impression, having previously warmed it between your hands, that it may be pliable.
1644. Place the lower surface of the leaf upon the blackened surface of the oil paper, that the numerous veins that are so prominent on this side may receive from the paper a portion of the smoke.
1645. Lay a paper over the leaf, and then press it gently upon the smoked paper, with the fingers, or with a small roller, (covered with woolen cloth, or some like soft material), so that every part of the leaf may come in contact with the sooted oil-paper.
1646. A coating of the smoke will adhere to the leaf.
1647. Then remove the leaf carefully, and place the blackened surface on a sheet of white paper, not ruled, or in a book prepared for the purpose, covering the leaf with a clean slip of paper, and pressing upon it with the fingers, or roller, as before.