IT CONTENTS. 



DECEMBER, 1803. 



Er.^ravinsjs of the following Ohje^ls : 1. A new Steam Valve which Indicates th« 

 Strength, and without Attendance, regulates the Emifllon of Steam from a 

 JSoiler. Comniunic ;ted by Mr. A. Woolf the Inventor; 2. Mr. G. Smart's 

 M:ichine now in daily Uie for Sweeping Chimnies, without Climbing Boys j 

 3. Improved Chemical Furnace; k Two Views of the great Fiery Meteor, 

 which appeared' Nov. 13, laft. 



3i Letter from Anclrew Duncan, M. D. F. R. S. E. containing Experiments 

 and Ohfcrvations on Cinchona, tending particularly to Ihew that it does not 

 contain Gelatine -._.._ 225 



II. Letter from a Correlpondent, containing Dilcjuifitions on the Phantalins 

 of Nicolai, and other Derangements of the Animal Syftem. - 22i> 



nr. Experiments on the Sublbnce vulgarly called Gum Kino. By Cit. 

 Vauquelin - - - - - ^ - -, 2.32' 



IV. Extract of a Letter from Dr. Prince refpe6ling his Air-Pump. 235 



V. Memoir on the Tides. By Cit. Lapiace - - 239 



VI. Abftraft of a Paper hy Cit. Guyton-Morveau, entitled an Examination of a 

 native Carbonate of Magnefia. - . _ _ _ 240 



VII. Curious Particulars refpeiling the Mountains and Volcanos, and the Ef- 

 feft of the late Earthquakes in South America, with Remarks on the Lan- 

 guage and Science of the Natives, and other Subjefls. By M. A. Von Hom- 

 boldt. - - _ _ - - _ - - - - 242 



VIII. Method of meafuring any Aliquot Part of an Inch by a Screw, which 

 gives no fuch Part in its Turn ; and Obfervation on an Error of Edwards in 

 placing the Eye- Stop of refle6\ing Telefcopes. In a Letter from Mr. J. C. 

 Hornblower. - - . _ - - . 247 



iX. Account of a new Apparatus conftrufled for the Purpofe of meafuring the 

 Elaftic Force, and regulating the EmifTion of Steam from the Boiler in which 

 it is generated. Communicated by the Inventor, Mr. Arthur Woolf, En- 

 gineer. ------_- 249 



"X.. Journey to the Summit of Mont-Perdu. By Cit. Ramond. 250 



XI- Notice of a Method of giving the Appearance of Cotton to Hemp or 

 Flax. ByCit. Ba-thollct: ----- 252 



XII. Defcription of a Macliine now in actual and daily Ufe, for deanling 

 Chimnies, without the Aflllbnce of Climbing-boys, and with much greater 

 Effect than is produced by that Metliod. Communicated by the Inventor, Mr. 

 Chriftopher Smart, of Ordnance Wharf, Weftminger Bridge. W.N. 255 



Xnr. Experimental Eifays on the Conltitution of mixed Gales; on the Force 

 of Steam or Vapour from Water and other Liquids in different Temper- 

 atures, both in a Torricellian Vacuum and in Air; on Evaporation; and on 

 the Expanfion of Gales by Heat. By John Dalton. - - 257 



XIV. Defcription of the portable Furnace conftiufted by Dr. Black, and fmce 

 improved. In a Letter from Mr. Accum. _ . - 273 



XV. Obfervations on the Structure of theTongue; illuftrated by Cafes in which 

 a Portion of that Or<)an has been removed by Ligature. By Everard 

 Heme, Efq. F. R. S. ^ - - - - - - 216 



XVI. Some Acc> unt of the large Fiery Meteor which appeared on the 13th of 

 laft Month (November) ' - - - '. - 279 



XVII. A Firft Memoir on Coloured Shadows. By Cit. J. H. HalTenfratz. 282 

 Scientific News, 28G. — Ohfcrvations on St. John's Wort. By Cit. Baunach, ib. 

 Account of New Book?, 28H. — The Edinburgh New Difpcniatory : containing, 



1. Tlu.'Eleratn'.s of Pharmaceutical Chemiilrv; 2. The Materia Mtdica ; or, 

 the Natural, Fharniaceutical, and Medical Hiftory of the different Subltances 

 employed in Medicine; 3. The Phaimaceutlcal Preparations and Compofitions, 

 &c. By Andrew Duncan, jun. M. D. Fellow of the Royal College of Phy- 

 ■ ficians, and Royal Society of Edinburgh, and Affoclate of the Linnrcan So- 

 ciety of Lcndoa - , %^ - - - ib. 



