CONTENTS. 



On the Inland Navigation of the United States of America, 



Parti. 1 



Comments on Corpulency. By William Wadd, Esq. F.R.S. , 16 

 On the Origin of Air Balloons . . . . .29 



An Essay on the Remittent and Intermittent Diseases, &c. by J. 



Mac Culloch, M.D. &c. reviewed . . . .34 



On Mineral Waters, Natural and Artificial. Communicated by 



Mr. A. Walker ...... 62 



Natural History of the Earwig . . . . ,78 



The Characters of Achatinella, a new group of terrestrial Shells, 

 with Descriptions of six Species. By William Swainson, 

 Esq. F.R.S. L.S. &c. ..... 81 



On the Comparative Population of the World in Ancient and 



Modem Times ...... 86 



An Account of a New Genus of Plants, named Macrsea. By 

 . John Lindley, Esq. F.R.S. , &c. .... 104 



On the Comparative Merits of the New Refracting, Reflecting, 

 and Single Microscopes, with a Vindication of Microscopic 

 Science, and its votaries. By C. R. Goring, M.D. . 107 



Hieroglyphical Fragments . . . . .122 



On the CUmate of the Canary Islands . . . .123 



On a Figured Variety of Coal, occurring in the Coal-field of Gla- 

 morganshire. By J. Mac Culloch, M.D. F.R.S. . I3i 

 Remarks on the Ruins at Palenque, in Guatemala, and on the 



Origin of the American Indians. By John Ranking, Esq. 135 

 On the Presence of Chlorine in the Black Oxide of Manganese 154 



Extracts from Dr. Ye ATs's Lectures on the Colon . .156 



Proceedings of the Royal Institution . , . .167 



On the Resonances, or Reciprocated Vibrations of Columns of 



Air . . . . . I .175 



On the Recent Improvements in the Art of Printing . , 133 



Proceedings of the Horticultural Society , . .192 



Astronomical AND Nautical Collections . . .195 



i. Simple Determination of the most ancient epoch of Astro- 

 nomical Chronology, in a Letter to Francis Baily, 



F.R.S. 195 



ii. Elementary View of the Undulatory Theory of Light. By 



Mr. Fresnel . . , . . .198 



iii. Principal Lunar Occultations of the Fixed Stars in the 

 months of May, June, July, and August, 1828, cal- 

 culated for the Royal Observatory at Greenwich. By 

 Thomas Hsnderson, Esq. .... 215 



