11 CONTENTS. 



ART, PAGE 



XI. An Account of a Barometrical Measurement of the Height 



of the Pico Ruivo, in the Island of Madeira. Extracted 

 from a Letter written by Captain Edward Sabine, of the 

 Royal Artillery, to Sir Humphry Davy, Bart., President 

 of the Royal Society, dated in January, 1823, on board his 

 Majesty's Ship Iphigenia, on passage between the Cape 

 Verd Islands and Goree 75 



XII. Analysis of a New Sulphur Spring at Harrogate. By 



William West, Esq. 83 



XIII. On the Vibrations of Heavy Bodies in Cycloidal and in Cir- 

 cular Arches, as compared with their Descents through free 

 Space : including an Estimate of the Variable Circular Ex- 

 cess in Vibrations continually decreasing. By Davies 

 Gilbert, Esq., F.R.S., &e. {with a Plate) . . 90 



XIV. Proceedings of the Royal Society .... 104 



XV. Proceedings of the Horticultural Society . . . 105 



XVI. Analysis of Scientific Books. 



A Comparative Estimate of the Mineral and Mosaical Geolo- 

 gies. By Granville Penn, Esq 108 



XVII. Astronomical and Nautical Collections. 



i. Empirical Elements of a Table of Refraction : computed from 

 Observations communicated and reduced by Stephen Groom- 

 BRiDGB, Esq., F.R.S 1-28 



ii. Errors of the Lunar Tables for 1819 and 1820. Computed 

 from the Observations made at Greenwich .... 131 



iii. Mr. Rumker's re-discovery of Enoke's Triennial Comet 132 



iv. Predicted and observed Places of the Principal Stars. By 

 John Pond, Esq., F.R.S., Astronomer Royal . . . 135 



XVIII. Miscellaneous Intelligence. 



I. Mechanical Science. 

 1. Economical Bridge. 2. Hydraulic Instrument for raising 

 Water. 3. Hydroparabolic Mirror. Standard Measure. 4. Feed- 

 ing of Engine Boilers. 5. Improved Printing. 6. Casting of 

 Stereotype-Plates, by M. Didot. 7. Calculating Engine. 8. Eng^ 

 lish Opium. 9. British Indigo. 10. Preservation of Grain, &c., 

 Ifom Mice. 11. Preseivation of Turnips. 12. Yeast. 13. Pre- 

 vention of Dry Rot. 14. Paste. 15. Improved Glaze for Red 

 Ware. 16. Soldering Sheet Iron, 17. New Form of the Voltaic 

 Apparatus. 18. Patent Portable Static Lamp. . . , 136 



