CONTENTS TO VOLUME XIII. 



NUMBER I. 



Page 

 Art. I. Miscellaneous contributions, descriptive of apparatus 



and inventions, by R. Hare, M. D. &c. &,c. - 1 



II. Rejoinder of Dr. Hare to the criticism of Professor 



Olmsted, - - - - - 8 



III. Observations and experiments on Opium ; by George 



W. Carpenter, of Philadelphia, - - 17 



IV. Chemical analysis and description of the coal lately 



discovered near the Tioga river, Penn. by William 

 Meade, M. D. - - - - ' 32 



V. Notice of a Meteoric Fire Ball ; by the Rev. S. E. 



Dwight, - - - - 35 



VI. Miscellaneous geological observations in Ohio ; by Dr. 



S. P. Hildreth, of Marietta, - - 38 



VII. Intelligence and remarks respecting High Pressure 



Steam Engines; from the Franklin Journal, - 40 

 VIII. Description and specification of a hydrostat, for steam 



engine boilers ; by Isaac Doolittle, - 64 



IX. Notes on the doubtful reptiles ; by Daniel H. Barnes, 66 

 X. Notice respecting Magnetic Polarity ; by D. H. Barnes, 70 

 XI. Reply of Mr. Quinby to Mr. Blake's criticism on his 



demonstration of the crank problem, - - 73 



XII. Answer to Mr. Quinby, - - - 75 



XIII. Sketches of the Geology, &c. of Alabama; by William 



S. Porter, 77 



XIV. Animadversions on M. Genet's Memorial; by Dr. Thom- 



as P. Jones, Professor of Mechanics, &c. - 79 



XV. Notice of Mr. Nuttall's Introduction to Botany, 99 



XVI. On Volcanos — Notice of Mr. G. Poulett Scrope's Con- 

 siderations on Volcanos, - - - 106 

 XVII. Account and analysis of the New Mineral Spring at 



Albany, by William Meade, M. D. - - 145 



INTELLIGENCE AND MISCELLANIES. 

 I. Foreign, 



1, 2. Prussia. Public instruction — Iron, varieties of 159 



3. Astronomical Observatory, - - - IgO 



