yi CONSENTS. 



NOVEMBER, 1808, 



Engi-avings of the following Objects: 1. Mr. Mendham's Escapement: 2. Mr, 

 Davis's Chimney Brush: 3. Mr. Davis's Pannels for Security: 4. Mr. Tonne- 

 lier's Renniarks on the_Meionite. 



I. Observations on the Exhausting Machine of Dr. Thomas Stewart Traill. By 

 Mr. Robert Bancks, Mathematical Instrument Maker, in the Strand 16'l 



II. On Superacid and Subacid Salts. By William Hyde WollastoHj, M. D, 

 Sec. R.S. ------ 164 



III. Account of Experiments on Sweeping Chimneys. By Mr. George Smart 



170 



IV. Description of a Machine for cleansing Chimneys, without the Use of 

 climbing Boys. By Mn Joseph Davis, No. 14, Crescent, Kingsland Road 



173 

 v. Account of an Invention to secure the Pannels of Doors and Window Shut- 

 ters from being cut out by House-breakers. By Mr. Joseph Davis, No. 14, 

 Crescent, Kingsland Road - - - - 177 



VI. Description of a new Watch EsCapement. By Mr. Si Mendham, Counter 

 Street, Borough ----- I'ts 



VII. On the Fecula of Potatoes, and some other British Vegetables. By Mr. 

 William Skrimshire, Jun. - - . . igg 



VIII. Remarks on Meionite, with some Observations on a Paper by Mr. Fre- 

 deric Mohs, in which this Substance is considered as a Variety of Feldspar^ 

 By Mr. Tonnelier, Keeper of the Cabinet of Mineralogy to the Council of 

 Mines - - - - - - 191 



IX. Method of finding the Quantity of Refraction from the Distance and Al- 

 titude of two known Stars; and of solving by Construction a Problem in Sphe- 

 rical Trigonometry. In a Letter from a Correspondent * 20 1 



X. Early Account of an Albiness. In a Letter from John Bostock, M. D. 203 



XI. Remarks on the Doctrines of Chance, in Answer to Opsimathj in a Letter 

 from W. Saint, Esq. - - ' - - 204 



XII. Further Remarks on the Doctrines of Chance. By Opsimath 210 



XIII. Memoir on the Organ by which the fertilizing Fluid is capable of being 

 introduced into the Ovula of Vegetables. By P. Turpin. Read at the Na- 

 tional Institute, Dec. 4, 1808 - - - - 214 



XIV. Essay on the Composition of Alcohol and of Sulphuric Ether. By The- 

 odore de Saussure. Read to the Physical aud Mathematical Class of the In- 



• stitute, April the 6th, 1807 - - - - 222 



XV. Letter on the Subject ©f the new Metals. By Mr. A. Combes 231 



XVI. Remarks on Ignition by Compressed Air. In a Letter from ). A. De Luci 

 Esq. - - - - - - 234 



XVII. On the Disadvantage of Jewelled Holes in Clockwork. In a Letter from 

 Mr. W. Walker, to Mr. J. Barraud - - - 23(3 



Scientific News - - - - • 237 



Meteorological Journal - - » - « 240 



DECEMBER, 



