11 CONTENTS. 



Page 



IX. Observations on the Theory which ascribes Secretion 



to the Agency of Nerves. By W. P. Alison, M.D., 

 F.R.S.E., &c 106 



X. Some Account of Messrs. Perkins and Fairman's 

 Inventions connected with the Art of Engraving 124 



XI. On the New Hygrometer. By J. F. Daniell, Esq. 

 F.R.S. and M.R.I 128 



XII. Account of the Exhumation and Re-interment of 

 King Robert Bruce 138 



XIII. Reports of the Commissioners appointed for enquir- 

 ing into the Mode of preventing the Forgery of Bank 

 Notes 142 



XIV. Proceedings of the Royal Society 148 



XV. Astronomical and Nautical Collections. No. 1. 



i. An Essay on the easiest and rtiost convenient Method 

 of Calculating the Orbit of a Comet from Observations. 

 By WiLLiAai Olbers, M.D., Weimar. Translated from 

 the German. With Notes 149 



ii. Extract of a Letter from Dr. Olbers, of Bremen, dated 

 29th Nov. 1819 163 



iii. Observations and Elements of the Orbit of the Great 

 Comet of 1819. By the Rev. J. Brinkley, D.D., F.R.S. . . 104 



iv. Lunar distances of Venus : April, May, and June, 

 1820, computed by the Astronomers of the Scuole Pie, ai 



Florence 1 68 



XVI. Miscellaneous Intelligence. 



I. Mechanical Science. 



^. Astronomy, Hydrodynamics, ^'c. 



1. New Comet. 2. Comet. 3. On the Force of a ^Jet 

 of Water. 4 Improvement of Scissors. 5. Clocks. 6. 

 New Musical Instrument. 7. New Acoustical Machine : 

 TheSicen 171 



II. Chemical Science. 

 ^ Chemistry. 



1 , Separation of Magnesia and Lime. 2. On the Nature 

 of Prussian Blue. 3. Refractive Powers of Muriatic Acid. 

 4. Formation of Ammonia. 5. Change of Voice by Hy- 

 drogen. 6. Acetate of Alumine. 7. On Testing different 

 Metals by Cupellation. 8. New Yellow Dye, for Wool, 

 Silk, Cotton, Flax, &c. 9. Preservation of Crystals. 10. 



