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JAMES F. W. JOHNSTON, M.A., F.R.S., F.G.S.,
CITISM OF AGRICULTURAL CHEMISTRY AND GEOLOGY," ETC.
ILLUSTRATED WITH NUMEROUS WOOD ENGRAVINGS.
846 & 848 BROADWAY.
TO SIR DAVID BREWSTER,
K.L. D.C.L F.R.S. V.P.P.S., EDINBURGH, ASSOCIATE OF THE INSTITUTE OF FRANCE,
AND PRINCIPAL OF ST. LEONARD'S COLLEGE, BT, ANDREW'.
MY DEAR SIR DAVID,
I dedicate this little Work to you, partly that I may have the honour of associating with it a name so eminent in science as yours, and partly for the opportunity it gives me of expressing my sense of the many obligations I owe you as an old and tried friend.
Being yourself not only a lover and assiduous cultivator of science, but a remarkable extender of its boundaries—a leader in one of its most interesting and intricate departments—and an anxious diffuser of the results of general scientific research-I am certain of your sympathy in the following attempt to render popular some of the more immediately applicable results of that branch to which I have myself been now long devoted. If we, whose profession it is to follow the progress of science, can scarcely keep pace with the advance of our several departments, it must be especially necessary, from time to time, to present its more striking novelties, in an intelligible form, to the general public.
With sincere wishes that your health may be long preserved, and that optical science may still for many years number you among its most illustrious cultivators,
Your obliged friend,
DORIAM, October, 1853.