11 CONTENTS. 



ART. PAQB 



IX. On the Hygrometric Properties of Insoluble and Difficultly- 

 soluble Compounds. By T. Griffiths 92 



X. On the Production and Nature of Oil of Wine (Oleum iEthereum 



of the London Pharmacopoeia). By Mr, H. Hennell, Che- 

 mical Operator at Apothecaries' Hall. .... 96 



XI. Proceedings of the Royal Society of London . . . 98 



XII. Analysis of Scientific Books. .... 100 



XIII. Astronomical AND Nautical Collections, No. XXL 



i. Remarks on the Determination of the Longitude, from Obser- 

 vations of the Moon's Right Ascension. By Thomas Hender- 

 son, Esq. 109 



ii. Discordance of the Lunar Observations made at Greenwich, 

 and at Paris. In a Letter from Thomas Henderson, Esq. . 116 



lii. A Rule for clearing the Lunar Distance from the effects of 

 Parallax and Refraction. By Charles Black bur ne, Esq. 117 



iv. Catalogue of the Stars in a Southern Constellation, denomi- 

 nated the Comet of Encke. By Mr. Charles Rumker ^ . 118 



V. Remarks on Hones. Addressed to the Editor by a Correspon- 

 dent 130 



vi. Further Remarks on Lunar Transits, in illustration of Mr. 

 Henderson's Paper 121 



vii. Second Memoir on the Theory of Magnetism. By Mr. 

 PoissoN, Read to the Royal Academy of Science, 27th Dec. 1824. 

 From the Annales cle Chimie for January, 1825. . . . 122 



XIV. Miscellaneous Intelligence. 



I. Mechanical Science. 



1. Improvement in Microscopes. 2. Capillary Attraction. 3. Em- 

 bossing on Wood. 4. Drawing of Iron Wire facilitated. 5. Haw- 

 kins's mode of preparing Emery. 6. Power of Building-materials to 

 resist frost. 7. Economical Method of Warming Manufactories, &c. 

 S. Method of Consuming the Smoke of steam-boiler furnaces, &c. 

 9. Graphical Trisection of an Angle. 10. Secret Writing. 11. 

 Ink similar to China Ink. 12. English Opium. 13. Letter to the 

 Editor of the Quarterly Journal of Science, Literature, and the Arts, 

 concerning Mr. Job Rider's Rotatory Steam Engine. By Andrew 

 Ure, M.D., F.R.S., &c 132 



