Telescope, notice of Barlow's refracting, xvii, 367.
—, Leon Lewenberg's, xxxviii, 379.
—, Rosse's, xlvi, 208; xlix, 221.
—, achromatic, Cauchoix's, xxii, 358.
—, improvements in, by J. Frauenhofer, xvi, 307.
—, notice of Holcomb's, xxiii, 403; xxvii, 185.
—, superior, of Lerebours, xvi, 302.
—, fourteen feet reflector, xxxv, 174.
—, improvement in, H. F. Talbot, xliv, 166.
—, on determining distances by means of, xlii, 164.