— —, small lakes running into, xxxvi, 42.
— —, shore of, and height of water in, xxxvi, 43.
Onyx, in Missouri, iii, 71.
Oolitic formation in America, xl, 41.
— — in New York, Orange Co., xix, 398.
— — —, in Saratoga Co., J. H. Steele, ix, 16.f
— — in Ohio, xlii, 233.
— fossils, remarks on, xxxiii, 107.
Oology, notice of W. Hewitson's work on, xxxvii, 166.
Opal at Vienna, a large, xii, 384.