TABLE OF CONTENTS 



TO THIS TWENTY-SECOND VOLUME, 



JANUARY, J 309. 



Engravings of the following Objects: 1. An improved Goniometer, by the Rev. 

 William Burrow j 2. Views of the late Comet, by Dr. Herschel: 3. Crystals 

 of the Diopside, a new Species of Mineral s 4. Mr. Christopher TowilPs Life 

 Boat. 



I. An Account of a Goniometer invented by the Rev. E. J. Burrow, A. M. FeU 

 low of Magdalen College, Cambridge - - i 



II. Observations of a Comet, made with a View to investigate its Magnitude, 

 and the Nature of its Illumination. By William Herschel, LL. D. F. R. S. 3 



III. Remarks on the Diopside, a new Species in Mineralogy established by Mr. 

 Haiiy, comprising two Varieties found in the Piedmontese Alps by Mr. Bon- 

 voisin, and described in the Journal de Physique for May 1806, under the 

 Names of Mussite and Alalite. By Mr. Tonnelier, Keeper of the Cabinet of 

 Mineralogy to the Council of Mines 14 



IV. Letter from Sir Thomas Clarges, Bart, of Sutton upon Derwent, to W. An- 

 nesley, Esq., on the Subject of Life-boats - - 20 



V. On the Origin and Office of the Alburnum of Trees. In a Letter from 

 T. A. Knight, Esq., F. R.S. to Sir Joseph Banks, Bart. K. B. P. R. S. 27 



VI. Letter on Polygonal Numbers, in reply to Mr. Gough. By P. Barlow, 



Esq. - - - - - 33 



VII. A Letter on the Differences in the Structure of Calculi, which arise from 

 their beiug formed in different Parts of the Urinary Passages ; and on the Ef- 

 fects that are produced upon them, by the internal Use of solvent Medicines, 

 from Mr. William Brande to Everard Home, Esq., F. R. S. - 35 



VIII. Some Observations on Mr. Brande's Paper on Calculi. ByEverard Home, 

 Esq., F.R.S. - - - - - 54 



IX. Electro-Chemical Researches on the Decomposition of the Earths ; with 

 Observations on the Metals obtained from the Alkaline Earths, and on the 

 Amalgam procured from Ammonia. By Humphry Davy, Esq., Sec. R.S. 

 M. R. I. A. (Concluded from Vol. XXI, p, 383) - - 54 



X. On the supposed universal Distribution of Fossil Coal, in Reply to Mr. 

 B. Cook, p. 292; and on the Nature and Situations of the extraneous Fossil 

 (Belemnite) analysed by Mr. J. Acton, at p. 305, under the Denomination of 

 a " Crystal" called a Thunder-pick. In a Letter from Mr, John Farey 68 



XI- Account of a British Vegetable Product, that may be substituted for Coffee. 

 Iq a Letter from Mr. William Skrimshire, Jun. - - , 70 



XII. Account of some ferruginous Rocks serving as Substitutes for Emery, By 

 Mr. Blavier, Mine Engineer - - - - 74 



XIII. Onthe Anthophyllite. By J.C. Delametherie - * 76 

 Scientific News ---_-„ j D , 

 MeteorologicalTable ■• 80 



FEBRUARY, 



