n CONTENTS. 



ART. PAGE 



iii. Nole respecting the C'onnaissance des Tons 176 



iv. An Essay on the easiest and most convenient Method 

 of calculating the Orbit of a Comet from Observations. By 

 William Olbers, M.D 177 



V. Further Remarks on the Transitof the Comet of 1819 

 over the Sun. By Dr. Olbers. — Bode's Jahrb, 1823. ... 182 



vi. Errors of the Tables of the Planets, with other 

 Notes, from Bode and Zach 1 82 



vii. Danish Standard of Length. Communicated by 

 Professor Schumacher 1 84 



XV. Corrections in Right Ascension of Thirty-six prin- 

 cipal fixed Stars to every Day of the Year. By James 

 South, F.R.S., Honorary Member of the Cambridge 

 Philosophical Society, and Member of the Astronomi- 

 cal Society of London 186 



XVL Miscellaneous Intelligence 199 



L Mechanical Science. 

 I 1. Agriculture, Optics, Astronomii, S^c. 

 1. Apparatus for Shewing the Double Refraction of Mine- 

 rals. 2. Diving Machine. 3. Astronomical Prize Question. 199 



XL Chemical Science. 

 § 2. Cliemistrij, Electricity, S^c. 

 1. Oxides of Manganese. 2. Dissection of Crystals. 

 3. Solution of Lime. 4. Lithia in Lepidolite. 5. Sponta- 

 neous Combustion. 6. Polishing Pov/der from Charcoal. 

 7. On the Colouring Matter of the Lobster. 8. Vegetable 

 Alkali, Daturium. 9. Vegetable Alkalis, Atropia, and 

 Hyoscyamia. 10. Lupulin, or the active Principle of the 

 Hop. 11. Analysis of Indian Corn. 12. Bohnenbergens' 

 Electrometer. 13. On the Composition of the Prussiates, 

 or Ferruginous Hydrocyanates. 14. Action of Heat on 

 the Hydrocyanates , 201 



III. Natural History. 

 § 3. Geology, Mineralogi/, Meteorology, S)C. 

 1. Dr. Mac Culloch's Geological Classification of Rocks. 

 2. On the new Mineral Conite. 3. Native Oxide of 

 Chrome, a new Mineral. 4. On Fullers' Earth in Chalk. 

 5. Discovery of Retinasphaltum in the Independent Coal 

 Formation. 6. Meteorological Observations at Melville 

 Island. 7. Chromate of Iron in the Island of Unst 216 



IV. General Literature. 

 1. Recent Discovery of a Fragment of Art in Newfound- 

 land. 2. Consumption of Food in Paris 223 



Quarterly List of New Publications 225 



