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FOR

AN ESSAY

TOWARDS A

MATERIA MEDICA

OF THE

UNITED-STATES.

BY BENJAMIN SMITH BARTON, M. D.

PROFESSOR OF MATERIA MEDICA, NATURAL HISTORY, AND BOTANY, IN THE UNIVERSITY OF PENNSYLVANIA.

PART SECOND.

hanc etiam, MECENAS, aspice partem.

PHILADELPHIA:

PRINTED, FOR THE AUTHOR,

BY A. AND G. WAY.

DISTRICT OF PENNSYLVANIA.

TO WIT:

SEAL

BE it remembered, that on the fourteenth day of February, in the twenty-eighth year of the Independence of the United States of America, Benjamin Smith Barton, of the said District, M. D. hath deposited in this office, the Title of a Book, the right whereof he claims as Proprietor, in the words following, to wit:

"Collections for an Essay towards a Materia Medica of the "United States. By Benjamin Smith Barton, M. D. Professor of "Materia Medica, Natural History, and Botany, in the University "of Pennsylvania. Part Second.

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In conformity to the Act of the Congress of the United States, entituled "An Act for the Encouragement of Learning, by securing the Copies of Maps, Charts and Books, to the Authors and Proprietors, of such Copies, during the times therein mentioned, 'And also to the Act, entituled "An Act, Supplementary to an Act entituled "An Act for the encouragement of Learning, by securing the Copies of Maps, Charts and Books, to the Authors and Proprietors of such Copies, during the times therein mentioned, and extending the Benefits thereof to the arts of Designing, Engraving and Etching Historical and other Prints."

D. CALDWELL,

Clerk of the District of Pennsylvania.

ΤΟ

JOHN COAKLEY LETTSOM, M. D.

FELLOW OF THE ROYAL SOCIETY OF LONDON, &c. &c.

DEAR SIR,

You have been pleased to express yourself favour

OU

ably respecting the First Part of this little work. But it was not this circumstance that has led me to inscribe this Second Part to you. My inducements to do this, are of a higher and a different kind.

YOUR attentions to me, during my residence in London, in the year 1787, were those of a kind and affectionate friend, and cannot readily be forgotten. Nor have you withdrawn your attentions, notwithstanding the distance by which we are separated from each other.

SOME public tribute of respect is due from Americans, to one who has so long, and on so many occasions, manifested his attachment to the United-States. The tribute which I now pay is, indeed, a very feeble one: but it is paid in the warmth of feeling friendship.

A LARGE portion of respect is due from the world to those, who devote their fortune and their time to the promotion of science, and the extension of the godlike empire of benevolence. Your enemies will not deny your

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