10 
Contributions to Geology, by Isaac Lea.— From the Author. 
Pamphlets on Scientific subjects, by Walter R. Johnson, Phil¬ 
adelphia.— From the Author. 
Discourses on Scientific subjects, by R. Dunglison, M. D., One 
of the Secretaries of the American Philosophical Society, 
Philadelphia.— From the Author. 
Act of Incorporation, By-Laws, and Catalogue of the Library 
of the Academy of Natural Sciences, Philadelphia.— From 
the Academy. 
Work on the Fossil Shells of the Tertiary Formations of North 
America, illustrated by^figures drawn on stone from Nature. 
By T. A. Conrad. Vol. I.— From the Author. 
Copper, Zinc, and Lead ores, Barytes, &c., from the Perki- 
omen Mines, near Philadelphia; and Chromate of Iron from 
the Island of Cuba.— From Richard C. Taylor , Philadelphia . 
Jeffersonite, in large crystals. Garnet, a very large crystal. 
Automalite, from Franklin, New Jersey.— From Isaiah 
Lukens , Philadelphia. 
Collection of Geological specimens, Minerals, Ores, Fossils, In¬ 
dian relics, &c. with a descriptive catalogue.— From Francis 
Markoe,jr, 
Fauna Columbiana, by T. B. J. Frye, M. D. in MS.— From 
the author. 
48 Specimens of American wood.— From John Lenthall , 
Naval Constructor , Philadelphia. 
A letter was read from Alexander Maclure of New Har¬ 
mony, Indiana, offering a suite of Geological specimens, Minerals, 
&c. from the Cabinet of his deceased brother, William Mac- 
lure, late President of the Academy of Natural Sciences of 
Philadelphia ; also, the following letter from the venerable Mr. 
Du Ponceau, President of the American Philosophical Society, 
and an honorary member of the National Institution. 
Philadelphia, November , 1840. 
To Francis Markoe, jr. 
Corresponding Secretary of the National Institution . 
My Dear Sir: I have read with great attention and pleasure the constitution 
and by-laws of the National Institution, which you have had the goodness to com- 
