U CONTENTS. 



ART. P.VGE 



IX. On the Change of Vegetable Colours as an Alkaline 

 Property. By Mr. Fauaday 315 



X. Proceedings of the Royal Society 317 



XI. Analysis of Scientific Books. 



i. The Use of the Blow-pipe in Chemical Analysis, and 

 in the examination of Minerals. By J. J. J. Berzelius. 

 Translated from the French of M. Fresnel, by J. G. Chil- 

 dren, F.R.S., &c., London, 1822 319 



ii. Dr. Thomson and his Answer 333 



Xri. Astronomical & Nautical Collections. No. X, 



i. A Table to facilitate the calculation of the Equation 

 to equal Altitudes, by D. Josef Sanches Cerquero, Lieu- 

 tenant of a Frigate of the National Navy, in the Observa- 

 tory of the City of Saint Ferdinand. Translated and 

 communicated by Mr. Andrew Livingstone 353 



ii. An Essay on the easiest and most convenient method 

 of calculating the Orbit of a Comet from Observation. 

 By William Olbers, M.D., 8vo., Weimar 366 



XIII. Results of some Astronomical Observations made in 

 Blackman-street. By James South, F.R.S., in Lat, 

 51° 31' 3"N., Long. 21".76 W 386 



XIV. The Mean Places of Forty-six Greenwich Stars, re- 

 duced to January, 1822 387 



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

 cipal fixed Stars. By James South, F.R.S 388 



XVI. Tables of Equivalents for converting Hours, Minutes, 

 and Seconds into Space, and for converting Degrees, 

 Minutes, and Seconds into Time , 394 



XVII. Progress of Foreign Science . , 396 



XVIII. Miscellaneous Intelligence. 



I. Mechanical Science. 



^ Astronomy, the Arts, &'c. 



1. Improved Signal for Trigonometrical Measurements. 

 2. New Observations. 3. Astronomical Prize. 4. Cleans- 

 ing of Orchard Trees by Lime. 5. Purification of Oil. 



