IV CONTENTS. 



Page 

 XVI. Notice of the late Aurora Borealis ; by Mr. Benjamin 



D. Silliman, and others, - 91 



XVII. Contributions towards the Botany of the states of Illi- 

 nois and Missouri; by Lewis C. Beck, M. D. 112 

 XVIII. Remarks on Mr. Barnes' Notice respecting Magnetic 



Polarity; by a Surveyor, - - 121 



XIX. A Chemical Analysis of the Pittsburgh Mineral 



Spring ; by William Meade, M. D. - 124 



XX. On the Combinations of Chromium ; by Augustus A. 



Haves, ----- 136 



XXI. Geological Nomenclature, Classes of Rocks, &c. ; 



by Prof. Amos Eaton, - - - 145 



XXII. Account of the Welland Canal, Upper Canada; by 



William Hamilton Merritt, Esq. Superintendant, 159 



XXIII. Long's Steam-Pump, - - - 169 



XXIV. An Account of a Water Spout, seen off the coast of 



Florida, in the spring of 1826; by Benjamin Lin- 

 coln, M. D., Boston, - - 171 

 XXV. On the Cause of Fresh Water Springs, Fountains, &c. ; 



by Joseph Du Commun, - 174 



INTELLIGENCE AND MISCELLANIES. 



I. Domestic. 



1. Meteorological Report for the year 1827, - 176 



2. Native Iron ? slightly arseniuretted, - - 183 



3. Note, from R. Harlan, M. D. on the large bones from 



the mouth of the Mississippi, - - 186 



4. Teeth of the Mastodon, - - - 187 



5. Life Preservers — Cloth impervious to air and wa- 



ter, &c, ----- 189 



6. 7, 8. Vermont Manganese — Geological Notice — Pro- 



ceedings of the Lyceum of Natural History, New 



York, 190 



9. Pressure of water at great depths in the ocean, - 194 



10. Effects of friction on board of Ships of War, - 196 



11. Valuable collection in Geology and Mineralogy, 197 



12. American Porcelain, - - - - 198 



13. 14, 15. Meteor of a green color — Southern Review — 



Asbestos, - - - - - 199 



16. Engraving and description of the Hydro-Pneumatic Cis- 



tern, used in the Laboratory of the University of 



Pennsylvania ; by R. Hare, M. D. Professor of 



Chemistry, - - - - 200 



17. Improved Scale of Chemical Equivalents, - 202 



