The Extracts have been made from the following 
works : 
1. The article Conchology, in the American Edition of Nichol- 
son’s Encyclopedia, 2d ed. Philad. 1818, vol. iv., with figures. 
2. Numerous articles in the Journal of the Academy of Natu- 
ral Sciences of Philadelphia, vols. i. ii. v. 
3. Expedition to the Source of St. Peter’s Kiver, &c., &c., under 
the command of Major Long. Yol. ii., Appendix, with figures. 
Philad. 1824. 
4. American Conchology, or Descriptions of the Shells of 
North America. Illustrated by colored figures. New Harmony, 
Indiana, 1830-34. 
5. Disseminator of Useful Knowledge. New Harmony, Indiana, 
1829-31. 
6. Transylvania Journal of Medicine. Vol. ii., 1832. 
The extracts from the last two Journals have been made from 
the republication by Mrs. Say, New Harmony, 1840, under the 
title, “ Descriptions of some new Terrestrial and Fluviatile Shells 
of North America.” 
