171 



mia real das Sciencias de Lisboa por Joaquim Jose da Costa de 

 Macedo, do Conselho de S. M. e Commendador da Ordem de N. 

 Senhora da Conceicao de Villa Viciosa, &c. &c. 8vo. Lisboa, 

 1838. — From the Author. 



Answers to the Questions : What constitutes Currency ? What are 

 the Causes of Unsteadiness of the Currency? and What is the Re- 

 medy? By H. C. Carey, author of " Principles of Political Eco- 

 nomy," &c. &c. 8vo. Philadelphia, 1840. — From the Author. 



An Address to the Members of the Mississippi Legislature on the 

 subject of the Geological Survey of the State. By C. G. Forshey. — 

 From the Author. 



The American Journal of Science and Arts. Conducted by Benja- 

 min Silliman, M. D. LL. D., &c. &c. Aided by Benjamin Silli- 

 man, jr., A. B., &c. &c. Vol. xxxviii. No. 1. Jan. 1840. — 

 From the Editors. 



A Monograph of the Limniades and other fresh water Univalve Shells 

 of North America. By S. Stehman Haldeman, Member of the 

 Academy of Natural Sciences of Philadelphia, &c. &c. (Speci- 

 men number.) 8vo. Philadelphia, 1840. — From the Author. 



Rapports a M. le Comte de Montalivet, Pair de France, Ministre 

 Secretaire d'Etat au Departement de l'Interieur, sur les Peniten- 

 ciers des Etats-Unis, par M. Demetz, Conseiller a la Cour Roy- 

 ale, Membre du Conseil General du Departement .de Seine-et- 

 Oise, et par M. G. Abel Blouet, Architecte du Gouvernement, Di- 

 recteur de la Section des Beaux Arts de l'Expedition Scientifique de 

 Moree. Folio. Paris, 1837. — From Dr. Bache. 



Mr. Saxtoh laid before the Society several copies of medals, 

 produced by the galvanic process of Prof. Jacobi, of St. Pe- 

 tersburg, and a small vase, obtained by a similar process, using 

 a fusible metal matrix, which was removed when the form was 

 obtained. 



Mr. Lea exhibited nearly forty specimens of representations 

 of plants and shells, by the photographic process of Talbot, 

 modified by Mr. Mungo Ponton, of Edinburgh. They were 

 prepared by his son, Mr. Carey Lea, and were entirely suc- 

 cessful; the minute parts of the plants, and the outlines being 

 perfect. 



