11 CONTENTS. 



ART. PAGE 



X. A Monograph of the Genus Tachyphonus ; a Group of Birds 



belonging to the Tanagrae of Linnaeus. By William Swain- 

 son, Esq., F.R. and L.S., &c. 60 



XI. Supplement to a Paper on the Vibrations of Heavy Bodies, in 

 the Fifteenth Volume of this Journal. By Davies Gilbert, 

 Esq., M.P., Treas. R. S„ &c. 69 



XII. Correction of an Error in the " Meteorological Essays." By 



J. F. Daniell, F.R.S. i . . . . 74 



XIII. On the Barometer. By J. F. Daniell, F.R.S. . . 78 



XIV. Astronomical and Nautical Collections, No. XXIII. 



i. A Method of Computing the Sun's Horizontal Parallax from 

 Observations of the Transits of Venus. By T. Henderson, Esq. 94 



ii. Remarks on the Discordances observed between the Lunar 

 Observations at Greenwich and Paris. By T. HENDERsoN.Esq. 96 



iii. The Latitude of Greenwich, as computed by Professor Bessel 98 



iv. Bessel's latest Fundamental Catalogue of Stars, deduced 

 from his Observations in the last five years. Schum. Nach. No. 78. 99 



v. Abstract of Captain Sabine's Experiments to determine the 

 Figure of the Earth. Printed at the expense of the Board of Longi- 

 tude, 4to. London, 1825 100 



vi. Extract from a Letter addressed by Professor Bessel to Pro- 

 fessor Schumacher, relating to the Greenwich Observations . 108 



XV. Analysis of Scientific Books. 



I. An Attempt to establish the First Principles of Chemistry by 

 Experiment. By Thomas Thomson, M.D. Regius Professor of 

 Chemistry in the University of Glasgow, F.R.S. Lond. and Edin., 



&c. &c. . . . . 113 



II. An Account of Experiments to determine the Figure of the 

 Earth by means of the Pendulum vibrating Seconds in different Lati- 

 tudes ; and on various other Subjects of Philosophical Inquiry. By 

 Captain Edward Sabine, F.R.S. &c. . • 141 



III. Remarks on Professor Spohn's Essay de Lingua et Literis 

 Veterum iEgyptiorum, edited by Professor Seyffarth * 159 



XVI. Miscellaneous Intelligence. 

 I. Mechanical Science. 

 1. Dr. Black's Sensible Balance. 2. Tenacity of Iron, as ap- 

 plicable to Chain Bridges. 3. Moving Rocks of Salisbury. 4. 

 Etruscan Vases. 5. On the Repulsion exerted by heated Bodies at 

 sensible Distances. 6. Polarized State of Halo Light. 7. Nature 

 of Shooting Stars seen during Day-time. 8. Astronomical Prize 

 Question ; Natural Philosophy 161 



