CONTENTS 



O F T H E 



^THIRTEENTH VOLUME. 



I. UN the different Proportions of Carbon which conflitute I he- 

 various Qualities of Crude Iron and Steel} being a Con- 

 tinuation of' the Experiments on the fame Subject detailed 

 in our laft Volume, By David Mushet, Efq. of the 

 Calder Iron Works - - Page 3 



II. Memoir on Gluten. By Charles Louis Cadet, of 

 the College of Pharmacy, Paris 9 



III. Obfervations on the Acetic and Acetous Acids, By 



C. DARRACQ, 12 



IV* Defcription of a new Implement called a Cultivator, By 

 Mr. William Lester, of Northampton - 20 



V. Defcription of a newly invented Under/hot Water-wheel . 

 By Mr. J. Besant, of Brompton - 22 



VI. Experiments and Obfervations on certain Story and 

 Metalline Subjlances which at different Times are Jaid to 

 have fallen on the Earthy alfo on various Kinds of Native 

 Iron, By Edward Howard, Efq, F. R. S, 23 



VII. Mineralogical Notice refpecling two great Peculiarities 

 lately found in Iron-flone from Hachenburg and Ichenburg, 

 By Mr, Cramer, Counfellor of Mines at Altenkirchai 31 



VIII. Memoir on the Anatomy of Vegetables, Redd before 

 the Vhyfical Clafs of the Injlitute ^ C. MiRBEL 36 



IX. Method of whitening the Gray Marine Salt to fit it 

 for dome/lie Purpofes inflantaneoujly , and without the Aid 

 of Heat. By Pajot Descharmes - 40 



"X. On the Alteration which Light produces on Bed fulphu- 

 rated Arfenic, known under the Name of Realgar. Read 

 in the French Injlitute by B. G. Sage, Dirtftor of the 

 Firjl School of Mines - - 42 



XL The Marquis of Worcefler's Scantlings of Inventions 43 



XII. Obfervations on the Magnetic Property of Cobalt and 

 Nickel. Extracted from a Memoir read in the French 

 National Injlitute by B. G. Sagi:, Director of the Firfi 

 School of Mines - - $$ 



XII E. Experiments and Obfervations on the Heat and Cold 

 produced by the mechanical Condenfaiion and Rarefatlion 

 of Air. By John Dal ion - - 59 



XIV. Some Account of Dr. Olbers, the celebrated AJlro- 

 nomer - - 64 



XV. Experiments on CharcoJ. By Clement and Des- 



ORMKS - 6j 



Vol. XIII. No. 52. a XVI. Notices 



