vi CONTENTS. 



MARCH J 806. 



Engravings of the folloiviiig Objefts : I. The Apparatus for blafting Rocks j 

 2. An improved PaiaHcl Line, by Mr. Bofwel! j 3. Captain Cowan's im- 

 proved Sails for Shipping, wincli, by Reefing at the Foot are much more 

 ipcedily and fafely managed than thofe of the ufual Conftru£lion. 



I. Experiments on the Temperature of Water furrounded by freezing Mix- 

 tures. In a Letter from John Gough, Efq. - - Page 189 



II. Account of the Art and Inftruments uied for boring and blafting Rocks; 

 with Improvements. In a Letter from G. C. > - 192 



III. Defcription of a new Parallel Rule, exempt from lateral Deviation; invented 

 by Mr. j. W. Bofwell; with an Account of the Imperfe^ions of thofe 

 already made for the fame Purpofe. - - - 196 



IV. Letter from an Enquirer, on the Wafte cf Filh aflerted to.be made on the 

 Scottifli Conft. In Reply to A. L. - - - - 200 



V. A Chemical and Medical Examination of the Gizzards of white Fowls 

 compared v\-ith Gelatine, together vtith an Expolition of the Charafterillics 

 of the latter when oxigenated. By M- Bouillon Lagrange. - 203 



VI. On Pirite found in France by M. Cocq, Commifl'ary of Gun-powder and 

 Saltpetre Works at Ciermont-Ferrant, with an Analyfis of this Subftance. 

 By J. J. Draj)picr, Teacher cf Chemilby in the Polytechnic Scheoi. 212 



VII. Experiments, fhewing, contrary to the AlftrtioMS of Morichini, that the 

 Enamel of Teeth dees not contain Fluoric Acid. In a Letter from W. 

 Brande, Efq. ._.-.. 214 



VIII. A Mernoir on taking the Levels of the vv'hole Surface of France. By 

 P. S. Girary, Chief Engineer of Bridges and Highways, &c. - 217 



IX. ObfervationS on the Conipofition of Water, and other Elementary Doc- 

 trines. ByH. B.K. - - - _ 503 



X. On the Conftruftion of the Sails of Ships and VelTels. By Malcolm Cowan, 

 El'q. Captain in the Royal Navy. - - - 'jog 



XI. Experiments on condenfed Gafes By T. Northmore. - 233 



XII. On'the Probability that Muriatic Acid is compofed of Oxigen and Hy- 

 drogen. In a Letter from Mr. J. Martin. ... 237 



XIII. Subftance of a Mtmoir re<-id before the Society of Emulation at Amiens, 

 by MefTrs. Reynard and Facquer, on the foul Air of Oil Cifterns. 23S 



XIV. Extraft from a Memoir, by MelTrs. Fouicroy avid Vauquelin, on the 

 Phenomena obfervt:d in, and the Relulrs obtained from Animal Matter, when 

 afted upon by NiuicAcid. Read at the National Inftitute, by A. Laugier. 240 



XV. Remarks relative tc Dr. Herlchel's Figure of Saturn. By an Oblerver. 246 



XVI. Experinx'ntsona Mineral Subftance formerly luppofed to be Zeolite; with 

 fome Remarks on two Species of Uran-glimmer. By the Rev. W. Gregor. 217 



XVII. Exnmination of different Methods of fcparating Nickel from Cobalt By 

 M. C. F. Bucholz. ------ 261 



XVIII. Sugar prepared from Beets. By M. Hermeftadt. - 267 



XIX. Method of Racking Turnips, to preferve them through the Winter. 

 By Mr. J. Shirr«tf, of Captain Head, near Haddington, N. Britain. 268 



XX. Account of fomt Specimens (.f Bafaltes from the northern Coaft of 

 Antrim. By the Rev. Dr. W. Richardfon. - . 273 



Scienliflc News, 274. — Almanack printed at Conftantinople, ib. — Obfervatory 

 at Bavaria, ib. — Eftablifliment for natural Philufophy in the Ukraine, 275. — 

 Obfervatory at Moflcow, ib.— Solar Tables, ib. — Bequcft of Erneft the Second 

 relative to his Obfervatory, 276, 



APRIL 



