Robiquet, on a new metallic dye, xxii, 197.
Rochefoucald, Duc de la, notice of, xiii, 167; xiv, 392.
Rochester, town of, ii, 252.
Rock crystal, see [Quartz.]
Rock, Paint, i, 67.
Rock, Putnam's, v, 37.
Rocks, Brongniart's seven classes of, xxxix, 149.
—, K. C. von Leonhard's arrangement of, xx, 182.
—, European, classification of, H. T. De la Beche, xviii, 26.
—, American, classification and characters of, L. Vanuxem, xvi, 254.