CONTENTS, iit 



JULY 1802. 



Engravings of the following Objects: 1. A new Apparatus for heating Water 

 to nearly the boiling Point by Means of Wafte Steam, by Mr. Arthur Woolf ; 

 2. An improved Mill, by Mr. G. Terry ; 3. Mr. Bullock's Drawback Lock j 

 4. Chryftals of Anhydrous Sulphate, by the Count de Bournon ; 5. Applica- 

 tion of a temporary Forcer, by Mr. Trevithickj 6. Lachenaie's Apparatus for 

 claying Sugars. 



I* Compofition of Writing Ink, pofTeiTingthe permanent Colour, and other eflen- 

 tial Properties, of the Ink ufed for Printing, In a Letter from Mr. William 

 Clofe. ----- Page 145 



JI. Of the Effects produced by the Vegetation of Plants in Atmofpherical Air. 150 



III. On the Theory of Light and Colours. By Thomas Young, M. D. 

 F. R. S. Profeflbr of Natural Philofophy in the Royal Inftitution. 162 



IV. An Analyfis of a Mineral Subftance from North America, containing a 

 Metal hitherto unknown. By Charles Hatchett, Efq. - 176 



V. On the Effeft of Sound upon the Barometer. By Sir Henry C. Englefield, 

 Bart. F. R. S. (From the Journals of the Royal Inftitution, No. 9.) 181 



VI. On the Expaniion of carbonated Hidrogtn by Electricity. From a Cor- 

 refpondent. - - - - - 184 



VII. A new Procefs for claying Sugars, propofed by Cit. Haffei Lachenaie, 

 Chief Apothecary of the Military Hofpitals of Guadaloupe, to the Agents of 

 the Confuls of the French Republic in the Windward Iflands. 187 



VIII. Defcription of the Cryftalline Forms of the Anhydrous Sulphate of Lime, 

 with fome Obfervations on this Subftance. By M. Le Comte de Bournon, 

 Member of the Royal and Linnasan Societies of London. Translated from the 

 Original; communicated by the Author. - - - 190 



IX. Analyfis of Natural and Artificial Anhydrous Sulphate of Lime. By 

 Rich. Chenevix, Efq. F. R. S. M. R. I. A. Communicated by the Au- 

 thor. - - - - - - 196 



X. Abridgment of a Memoir of Mr. Prouft, on Tanin and its Species. 198 



XI. Defcription of an Apparatus for heating Water by wafte Steam. In- 

 vented by Mr. Arthur Woolf. - - - - 203 



XII. Defcription of an improved Drawback Lock for Houfe Doors. By Mr. 

 Wm. Bullock. From the Transitions of the Society of Arts, who adjudg- 

 ed a Reward of Fifteen Gutnear, to the Inventor. - - 204 



XII I. Defcription of an improved Mill for grinding hard Subftances. By Mr. 

 Garnett Terry. From the Tranfa&ions of the Society of Arts, who adjudg- 

 ed the Silver Medal to the Inventor. - - - 206 



XIV. Remarks on Dr. Thomson's Theory of Combuftion. By C. P. (Re- 

 ceived June 15, 1802.) - ib. 



XV. On certain Points of Nomenclature; By a Correfpondent. 212 



XVI. Duplicate Copy of a Letter from Baron de Zach to the Right Honour- 

 able Sir Jofeph Banks, Bart. P. R. S. &c. tranfmitted to Mr. Edw. Trough- 

 ton, and communicated by the Rev. J. Pearfon ; on the new Planet Ceres 

 and Pallas, with the Elements of the Orbit of the former. - 213 



XVII. Method of applying a temporary Forcer to a Pump, fo as to produce a 

 conftant Stream. By Mr. Richard Trevithick. From the Author. 216 



XVIII. Experiments and Obfervations on certain ftony and metalline Sub- 

 ftances, which at different Times are faid to have fallen on the Earth ; alfo 

 on various Kinds of native Iron. By Edward Howard, Efq. F. R. S. * From 

 the Philofophical Tranfa&ions, 1802. - ib. 



Scientific News. Dimenfions and Nature of the new Planets Ceres and Pallas. 



By Dr. Herfchel— Extract of a Letter from the Rev. James Wilfon, D. D. 



Minifter of Falkirk. - - - - 221 to 222 



Recount of Books of Science, Memoirs of the Literary and Philofophical Society 



ofManchefter, g s ? - . 223 



AUGUST 



