CONTENTS 



I. Observations on Terrestrial Magnetism. By John Locke, M. D., M. A. P. S. 

 II. Researches on Electrical Rlieometry. By A. Secchi. 



III. Contributions to the Natural History of the Fresh Water Fishes of North America. 



By Charles Giraed. 



IV. Nereis Boreali- Americana, or Contributions to a History of the Marine Algae of North 



America. By William Henry Harvey, M. D., M. R. I. A. 



V. Plantse Wrightianas Texano-Neo-Mexicanae. By Dr. Asa Gray, M. D. 



VI. The Law of Deposit of the Flood Tide: its Dynamical Action and Office. By Charles 

 Henry Davis, Lieut. U. S. Navy. 



VII. Description of Ancient Works in Ohio. By Charles Whittlesey. 



APPENDIX 



I. Ephemeris of the Planet Neptune for the year 1852. By Sears C. Walker, Esq. 



II. Occultations visible in the United States and other parts of the World during the year 

 1852. Computed by John Downes. 



^mm 



