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District of Pennsylvania, to wit:
********* BE IT REMEMBERED, that on the twenty-second day
• SEAL.: of November, in the thirty-fourth year of the independence

of the United States of America, A. D. 1809, Hopkins and

Earle, of the said district, have deposited in this office the
title of a book, the right whereof they claim as proprietors, in the words,
following, to wit:
“ A Plain Elementary and Practical System of Natural Experi.

mental Philosophy; including Astronomy and Chronology. By
the late Rev. John Ewing, D. D. Provost of the University of
Pennsylvania. Being the Course of Lectures delivered by him
in that Seminary,(Enlarged and Improved from time to time,)
for upwards of twenty years. Illustrated by Copperplate En-
gravings. The whole carefully Revised and prepared for the
Press, with sundry Explanatory and Supplementary Notes;
By Robert Patterson, Professor of Mathematics in the said

University. With a Biographical Sketch of the Author.”
In conformity to the act of the Congress of the United States, inti.
tuled, “ An act for the encouragement of learning, by securing the co-
pies of maps, charts, and books, to the authors and proprietors of such
copies during the times therein mentioned.” And also to the act, enti-
tled “ An act supplementary to an act, entitled 'An act for the en-
couragement of learning, by securing the copies of maps, charts, and
books, to the authors and proprietors of such copies during the time
therein mentioned,' and extending the benefits thereof to the arts of
designing, engraving, and etching historical and other prints.”

Clerk of the District of Pennsylvania. -

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