BY THOMAS MACKELLAR, PH. D.

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PHILADELPHIA:

MACKELLAR, SMITHS & JORDAN FOUNDRY.

1893.

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Entered, according to Act of Congress, in the year 1866, by

L. JOHNSON & COMPANY,

In the Clerk’s Office of the District Court of the Eastern District

of Pennsylvania.

Entered, according to Act of Congress, in the year 1878, by

MACKELLAR, SMITHS & JORDAN,

In the Office of the Librarian of Congress, at Washington, D. C.

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Eighteenth Edition—Revised and Enlarged.

ELECTROTYPED BY

MACKELLAR, SMITHS & JORDAN FOUNDRY,

PHILADELPHIA.

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