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introduction to chemistry, as it was originally intended. This branch of science is become so very interesting, and the study of it'so general, that it would have been unpardonable to have devoted only a part of a volume to the discussion of it: the Author has, therefore, at the suggestion and desire of many friends, who have given their approbation to the Scientific Dialogues, undertaken to furnish a separate work on this subject, in two volumes, similar in size to this.

May 1, 1805.

TO

ANNA LÆTITIA BARBAULD

AND

JOHN AIKIN, M. D.

AUTHORS OF

“EVENINGS AT HOME,”

. AND

OTHER ADMIRABLE WORKS,

FOR

THE INSTRUCTION OF YOUNG PERSONS,

THE

FIFTH AND SIXTH VOLUMEG

OF

SCIENTIFIC DIALOGUES,

ARE

RESPECTFULLY INSCRIBED,

BY

THE AUTHOR.

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