II CONTENTS. 



ART. PAGl 



XIII. Account of Captain Parry's Discoveries in the 

 Polar Regions. ...... . , ^ 355 



XIV. On the recent Discoveries in Magnetism and Elec- 

 tricity ; 36 1 



XV. Letters from a Traveller in Africa to the Marquis 364 



C ANOVA 



XVI. Proceedings of the Royal Society of London 378 



XVII. Proceedings of the Academy of Sciences at Paris, . , , 388 



XVIII. Analysis of Scientific Books 393 



I. The Philosophical Transactions for 1 820, Part II. — i. On 

 a new Principle of constructing Ships in the Mercantile 

 Navy. By Sir Robert Seppings, F.R.S 303 



ii. Upon the different Qualities of the Alburnum of 

 Spring and Winter felled Oak-trees. By Thomas Andrew 

 Knight, Esq., F.R.S 395 



iii. Experiments on the Fungi which constitute the Co- 

 louring Matter of the Snow discovered in Baffin*s Bay. By 

 F. Bauer, Esq., F.L.S. 395 



iv. On the Errors in Longitude as determined by Chrono- 

 meters at Sea, arising from the action of Iron in the Ships 

 upon the Chronometers. By George Fisher, Esq 396 



V. On the Measurement of Snowdon by the Thcrmome- 

 trical Barometer. By F. J. H. Wollaston, B.D., F.R.S. 397 



vi. On Sounds inaudible by certain Ears. By Wii^liam 

 Hyde Wollaston, M.D. F.R.S. 398 



vii. On the Compressibility of Water. By Jacob 

 Perkins, Esq 399 



II. An Historical and Practical Treatise on the internal 

 use of the Hydrocyanic, or Prussic Acid, in i'ulmonary 

 Consumptions, &c. Second Edition. By A. 1'. (Gran- 

 ville, M.D., F.R.S., &c 399 



III. Recherches Experimentales, sur les Chaux de Con- 

 struction, Ics Betons, et les Mortiers ordinaires. Par L. J. 

 ViCAT, ancien Eleve de TEcole Polytcchnique, &c ^"407 



XIX. Astronomical & Nautical Collections, No. IV. 



i. Remarks on the Calculation of Parallax for a Spheroid 412 

 ii. Places of the Comet of 1 822. Calculated by Pro- 

 fessor Encke, and communicated by Dr. Olbers ..... . . 413 



iii. Dr. Olbers' Essay on Comets, continued from Vol IX. 4l6 



XX. Corections in Right Ascenyons of Forty-six principal 

 fixed Stars to every Day of the Year, together with some 

 Observations on the Transit Instrument, &c. By James 

 South, Esq. F.L.S., Hon. Mem. of the Cambridge Philo- 

 wphical Soc.,andMem.o.fthcAstronomicalSoc. of London 427 



