iv CONTENTS. 



DECEMBER, 18-05. 



Engravings of the following Obie&s : 1. Diagrams to illuftrate a Series of Pro'-' 

 pofitions refpe&ing a Divifion of the Circle, by Mr John Gough ; 2. Schemes 

 exhibiting the Pofition of the new Planet Juno, by Dr. Herfchell j 3. Dr. 

 Papc's Improvement of Rye Harbour. 



I. On the Divifion of an Arch of a Circle into two fuch Parts, that their Sines, 

 or Cofines, or Verled-Sines, (hall have a given Relation. In a Letter from 

 John Gough, Efq. - - - - - Page 225f 



II. Concerning the State in which the true Sap of Trees is depofited during 

 Winter. By Thomas Andrew Knight, Efq. 232 



III. On the Deliquefcence and Efflorefcence of Salts. By C. L. Cadet. 240 



IV. Account of the limple and eafy Means by which the Harbour of Rye* 

 \*as reftored, and made navigable for Ships of coniiderable Burthen. By 

 the Rev. Daniel ?3pe. - - - - 245 



V. New Experiments on the Refpiration of Atmofpheric Air, principally with 

 Regard to the Abforption of Azote, and on the Refpiration of the gafeous 

 Oxide of Azote. By ProfeiTor Pfaff, of Kiel. - - 249 



VI. Experiments on Gum Arabic and Gum Adracanth. By M. Vauquelin. 256 

 VII. Method of obtaining Cobalt pure. By M. Tromfdorf. - 258 

 VII T. A new Method of extracting Sugar from Beet-Root. By M. Achard. 259 



IX. On Nickeline (Niccolanum), a Metal in many Refpe&s refembling Nickel, 

 lately difcovered by Dr. J. B. Richter. - - - 261. 



X. Letter from G. Cumberland, Efq. on a ProjecT: for extended Roads on the 

 Principle of the inclined Plane. - 266 



XI. On the State of Provincial Societies for Scientific and Literary Improve- 

 ment. By a Correfpondent. - 267 ' 



XII. Notice of certain Inftances of wafteful Negligence in fome Fisheries in the 

 North. By an Enquirer. - 269 



XIII. On Bile. By M. Thenard. - - 269 



XIV. Quotation from Sir George Staunton's EmbafFy, containing a Defcrip- 

 tioh of Fire Works unknown in Europe. Propofed by a Correfpondent 

 with a View to obtain an Explanation of the Means by which they were pro- 

 duced. - - - - - - - 273 



XV. On the Carbonate of Potato. By M. Steinacher. - - 274 



XVI. Method of preparing aluminous Bottle, which long preferves itsEffeft. 276 



XVII. Analyfis of the Magnefian Earth of BaudifTero in Canavais (in the De- 

 partment of the Loire), known by the Name of Porcelain Earth, and hi- 

 therto ccnfidered as a Clay. By M. Giobert. - - 27T 



XVIIK Experiments for afcertaining how far Telefcopes will enable us to deter- 

 mine very fmall Angles, ?nd to diftinguifh the real from the fpurious Di- 

 ameters of celeftial and terreftrial Objects: with an Application of the Re- 

 iult of thele Experiments to a Series of Obfervations on the Nature and 

 Magnitude of -Mr. Harding's lately difcovered Star. By William Herichel, 

 L. L. ip. F. R. S. Abridged from the Phil. Tranf. 1805. - 2$5" 



XIX. Account of fome new Improvements in Steam-Engines. By Mr. Arthur 

 Woolf. - ' - - - - 294 



Scientific News, 2D6. — Geometry, ib- — Aftronomy, 297. — Geography, ib. — 

 Electricity, ib.~— Aeroftation, 298. — Univerfity of Charkow, ib. — Botanic 

 Garden. &c. at Copenhagen, 299. 



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