This Great Historical Engraving represents, assembled at the Royal Institution, authentic Portraits of the following illustrious men:--WATT, RENNIE, TELFORD, MYLNE, JESSOP, CHAPMAN, MURDOCK, the first to introduce gas into practical use; RUMFORD, HUDDART, BOULTON, BRUNEL, WATSON, BENTHAM, MAUDSLAY, DALTON, CAVENDISH, SIR HUMPHRY DAVY, WOLLASTON, HATCHET, HENRY, ALLEN, HOWARD, SMITH, the father of English Geology; CROMPTON, inventor of the Spinning Mule: CARTWRIGHT, TENNANT, RONALDS, the first to successfully pass an electric telegraph message through a long distance; CHARLES EARL STANHOPE, TREVITHICK, NASMYTH, MILLER of Dalswinton, and SYMINGTON, the inventors and constructors of the first practical Steam Boat; PROFESSOR THOMSON, of Glasgow; TROUGHTON, DONKIN, CONGREVE, HERSCHEL, MASKELYNE, BAILY, FRODSHAM, LESLIE, PLAYFAIR, RUTHERFORD, DOLLOND, BROWN, the botanist; GILBERT and BANKS, the Presidents of the Royal Society at that epoch of time; CAPTAIN KATER, celebrated for his pendulum experiments; DR. THOMAS YOUNG, and JENNER the benefactor of mankind. Engraved in the best style of Stipple and Mezzotinto by WM. WALKER and GEORGE ZOBEL. From an original drawing in Chiaroscuro. Designed by GILBERT; drawn by J. F. SKILL and W. WALKER. PUBLISHED BY W. WALKER & SON, 64, MARGARET STREET, CAVENDISH SQUARE, LONDON, W. _Size of the Engraving, without Margin, Forty-one by Twenty and a half Inches._ Plain Impressions, £5 : 5. Proofs, with Title and Autographs, £8 : 8. Artist Proof, with or without Autographs, £10 : 10. OPINIONS OF THE PRESS. TIMES. An Engraving before us comprises the portraits of 50 distinguished Men of Science of Great Britain who were living in 1807-8, and who are here represented as assembled in the Upper Library of the Royal Institution ... we can easily conceive, as the preface to an accompanying volume of biographies informs us, that the collection and combination of these portraits occupied five years,--for some of them, at this distance of time, must have been discoverable with very great difficulty. Thus we have among them portraits of some of the inventors of whom we know very little in proportion to their acknowledged capacities, such for example as Trevithick the friend of Robert Stephenson, and Murdock the Achates of James Watt and introducer of gas ... there can be little doubt that the 50 physiognomies are derived from authentic originals in every case, great diligence having been employed in searching for such in the hands of their representatives ... as we said, this engraving must not be regarded only as a work of art, but as a collection of portraits of special interest, some of which are not attainable in any other form; while, as a whole, they are an appropriate monument of _our greatest scientific epoch_. DAILY TELEGRAPH.