SPECTACLES.--WM. ACKLAND applies his medical knowledge as a Licentiate of the Apothecaries' Company, London, his theory as a Mathematician, and his practice as a Working Optician, aided by Smee's Optometer, in the selection of spectacles suitable to every derangement of vision, so as to preserve the sight to extreme old age. ACHROMATIC TELESCOPES, with the New Vetzlar Eye-pieces, as exhibited at the Academy of Sciences in Paris. The Lenses of these Eye-pieces are so constructed that the rays of light fall nearly perpendicular to the surface of the various lenses, by which the aberration is completely removed; and a telescope so fitted gives one-third more magnifying power and light than could be obtained by the old Eye-pieces. Prices of the various sizes on application to WM. ACKLAND, Optician, 93. Hatton Garden, London. * * * * * Printed by THOMAS CLARK SHAW, of No. 10. Stonefield Street, in the Parish of St. Mary, Islington, at No. 5. New Street Square, in the Parish of St. Bride, in the City of London; and published by GEORGE BELL, of No. 186. Fleet Street, in the Parish of St. Dustan in the West, in the City of London, Publisher, at No. 186. Fleet Street aforesaid.--Saturday, July 2. 1853. * * * * * Corrections made to printed original. page 8, "a medal won by an officer": 'a medal worn ...' in original (corrected, Issue 196). page 14, "cum tribus principalioribus digitis": 'principalionibus' in original