Vi CONTENTS. 



Page. 

 VII. A Synoptical Table of the Ferns and Mosses of the 



United States; by Lewis C Beck, M. D. - 287 



VIII. Original Papers in relation to a Coui-se of Liberal 



Education, 297 



IX. The History of Sea-Serpentism ; by Dr. Samuel 



L. MlTCHILL. . - - - - - 351 



INTELLIGENCE AND MISCELLANIES. 



1. Proceedings of the Lyceum of Natural History, N. 



York, 357 



2, 3. On the blue appearance of the heavens ; by Ben- 



jamin Hallowell, Alexandria, D. C. — On the twink- 

 ling of the stars, and the deception in the number 

 visible to the naked eye on a clear evening ; by 

 B. H. 360 



4. On the cause of hail during warm weather; by B. H. 361 



5, 6, Anthracite coal and liquids, in quartz crystals — Re- 



marks upon the eflfect of a blast of air between 

 contiguous surfaces ; by Cadet J. H. Taylor, 362 



7. Zodiacal Light, Halos, &c. ; by Mr, David Leslie, 364 



8. Leather sheathing for ships, . - - - 365 



9. Earthquakes on the Mississippi ; from the travels of Mr. 



Flint, 366 



10. New Instrument for drawing the curves of Conic Sec- 



tions ; by Prof. Abbott, . _ . . 36C 



11. Description of the Polariscope, invented by H. J. 



Brooke, Esq. F. R. S. &,c. ; communicated by Prof. 



J. W. Webster, 369 



12. Progress of the American Post Office Department, 373 



13. 14. American Blistered Steel — Notices of Palestine; 



by Rev. J. Bird, 374 



15. Horticultural Society of Paris, translated by Jacob 



Porter, _..--- - 378 



16. Method of preserving fruit without sugar, - - 381 



17. Miscellaneous Notices in Letters to the Editor, - 382 



18. Theory of a central heat, and other geological theories ; 



by William Maclure, P. A. G. S. - - 384 



19. New Minerals, 386 



20. Analysis of Tourmalines, 389 



21. 22 Botany of Brazil — Hydrate of Silex, - - 390 



23. Chloride of Lime, 391 



24, 25, 26, 27. Ultra-marine —Heat of combustion — Force 



of chemical action — Evaporation by means of blad- 

 ders, 392 



