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A
MONOGRAPH
OF THE
TRILOBITES OF NORTH AMERICA:
WITH
Coloured Models of the Species.

Multa renacentur quæ jam cecidere.—Hor.

BY

JACOB GREEN, M. D.
Professor of Chemistry in Jefferson Medical College.

PHILADELPHIA:
Published by Joseph Brano, No. 12, Castle Street.
Clark & Raser, Printers.
1832.

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Entered according to the Act of Congress, in the year 1832,by Joseph Brano, in the Clerk's Office of the District Court ofthe Eastern District of Pennsylvania.

The kindness which a traveller receives when in adistant land, must ever be among his most pleasingrecollections your attentions therefore to me, duringany short residence in London a few years since, cannoteasily be forgotten. Suffer me, then, to inscribethis little work to you as a token of my gratitude.

Our pursuits in the Natural and Physical Scienceshave been congenial. Your interesting researcheswith your original and magnificent Galvanic Battery,first drew my attention to the calorific effects of thatmysterious agent; and your works on Natural Historyhave stimulated my exertions in the same fascinatingpursuit.

A large portion of your time and fortune have beendevoted to the patronage or the cultivation of NaturalScience so that the dedication of this work toyou, if it were infinitely more worthy of your acceptance,would be due from me, both as a tribute ofhigh respect, as well as of grateful acknowledgment.

Philadelphia, October 1st, 1832.

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EXPLANATION OF THE PLATE.