CONTENTS. m 



NOVEMBER, 1S03. 



Engravings of the following Objefts ; 1. Mr. Woart's Method of fccviring TiiT- 

 bers which have been injured by the Dry Rot; 2. Cit. Lomet's Addition to the; 

 Sextantfor meafiiring vertical and oblique Angles at the fame Indant from an 

 Air Balloon, for Military Service; 3. Apparatus for drying Precipitate, and 

 for Procefles of Congelation. By Mr. Accum ; 4. Hydraulic Combination 

 for rendering the Atmofpheric Prefl'ure effeftive in railing Water in VVortu 

 Tubs. By Edward Howard, Efq. F. R. S. 5. Improvement in the Syphon. 

 By the fame; 6. Rotatory Apparatus, by which the Power of a Steam Engin(: 

 is equalized without a Fly, and the Work, may be flopped or it.t off in any 

 Part of the Stroke. By Mr. A. Woolf; 7. Improvement in Mr. Ezckiel 

 Walker's Reflecting Quadrant. By the Inventor. 



i. Experiments and Obfervations on the various Alloys, on the Specific Gra- 

 Tity, and on the comjiarative Wear of Gold. Abftrafted from theMeraoirol" 

 Charles Hatchett, Efq. F.R. S. in thePhilofophical Tranfaaionsfor 1803. 14:1 



II. A Memoir on the Appearance of Speflres or Phantoms occafioned by Dif- 

 eafe, with Pfychological Remarks. Read by Nicolai to the Royal Society oi 

 Berlin, on the 28th of February, 1799 - - - 161 



III. Analylis of Ambergris ; by Cit. Bouillon La Grange - - 173 



IV. An Account of fome Stones faid to have fallen on the Earth in France; and 

 of a Lump of native Iron, faid to have fallen in India. By the Right Hon. 

 Charles Greville, F.R. S. ------ J87 



V. Analylisof the Natrolite. By Klaprotli . - _ i9| 



VI. On the Employment of Aeroftatic Machines in the Military Science, and 

 for the Conftruftion of Geographical Plans. By Cit. A. F.Lomet l^\\ 



VII. Chemical Analyfis and Properties of Arfenlated Hidrogen Gas. By Pro- 

 feflbr Tromfdoiff ------ 200 



VIII. Account of an Eudiometric Apparatus, contrived and ufed by Dr. 

 Hope, Profeffor of Chcmiftry in the Univerlity of Edinburgh - 210 



IX. Defcription of an Apparatus for drying the Produ6ts of Chemical Annlyilj, 

 which is alfo ufeful for Experiments of Congelation. By Mr. Fiedericllc 

 Accum. Communicated by the Inventor . _ - 91*2 



X. Letter from Mr. Accum, in anfwer to the Enquiries of a Correfpondci! t 

 refpefling the Procefs for obtaining the Aguftine Earth - 214 



XI. Letter from a Correfpondent concerning the Method propofed by My. 

 Carlifle for clofmg wide-mouthed Veflels - - - 2 If) 



XII. Account of an Experiment for fupplying Worm Tubs and other Refrigera-t 

 tories by the affiliant Prellure of the Atmofphere, which proved unfuccefs- 

 ful, on a large Scale ; to which is added an Improvement for extending thei 

 ufeful Application of the Syphon. By Edward Howard, Efq. F.R. S. In a' 

 Letter io the Editor ------ 216 



XIII. A Method of equalizing the Motion of a Steam Eftgine without the 

 Afliftance of a Fly Wheel. By Mr. Arthur Wooif, Engineer, Communi- 

 cated by the Inventor - - - - - -218 



XIV. Improvement by which the/additional Arc in Mr. Ezckiel Walker's re- 

 flecting Quadrant is rendered unneceffary. In a letter from the Inventor 219 



Scientific News, 221. — Abflract of Cit. Seguin's Inquiries concerning Fermen- 

 tation, ib. — Additional Experiments of Mr. Ritter, of Jena, on Galvanic Phe- 

 nomenu, ib. — AbftracSl: of Ibme Remarks on the Acetite of Lead, by Cit- 

 Thenard, 223.— The Arachis Hypog^sa, or Ground Nut of the Weft Indies, 

 cultivated in France for its Oil „ - - - - gj* 



'jDECEMBER. 



