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dition, resulting in the apparent disappearance of Conversations XI and XII. Typographical errors are listed at the end of the text.] * * * * * * * * * * * * * * CONVERSATIONS ON CHEMISTRY; In Which The Elements Of That Science Are _Familiarly Explained_ And Illustrated By Experiments. IN TWO VOLUMES. _The Fifth Edition, revised, corrected,_ _and considerably enlarged._ VOL. I. ON SIMPLE BODIES. _London:_ Printed For Longman, Hurst, Rees, Orme, and Brown, Paternoster-Row. 1817. Printed by A. Strahan, Printers-Street, London. ADVERTISEMENT. _The Author, in this fifth edition, has endeavoured to give an account of the principal discoveries which have been made within the last four years in Chemical Science, and of the various important applications, such as the gas-lights, and the miner's-lamp, to which they have given rise. But in regard to doctrines or principles, the work has undergone no material alteration._ _London_, _July_, 1817. PREFACE. In venturing to offer to the public, and more particularly to the female sex, an Introduction to Chemistry, the author, herself a woman, conceives that some explanation may be required; and she feels it the more necessary to apologise for the present undertaking, as her knowledge of the subject is but recent, and as she can have no real claims to the title of chemist. On attending for the first time experimental lectures, the author found it almost impossible to derive any clear or satisfactory information from the rapid demonstrations which are usually, and perhaps necessarily, crowded into popular courses of this kind. But frequent opportunities having afterwards occurred of conversing with a friend on the subject of chemistry, and of repeating a variety of experiments, she became better acquainted with the principles of that science, and began to feel highly interested in its pursuit. It was then that she perceived, in attending the excellent lectures delivered at the Royal Institution, by the present Professor of Chemistry, the great advantage which her previous knowledge of the subject, sli
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