CONTENTS OF VOL. XXIII. 



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I. Some original Remarks on a Variety of the Genus 

 Acarus, heionging to the Order Aptera, fozind en the 

 IVivgs, &c. of a feathered Fhj of the Order Diptera, 

 By Mr. John'Snart, Optician Page 3 



II. 'On a Colour for marking the Ends of Cotton or Linen 

 Cloths capable of resisting the Operations of bleaching, 

 and likeivise the most complicated Manufacture of printed 

 Cloths, itithout extending beyond the Limits oj the ori- 

 ginal Impression. By M. Hauffman 8 



III. yl Famish which preserves Vessels made of Copper or 

 other Metals from the Action of' Acids of a certain 

 Strength. % A/. Hauffman 13 



IV. New Method of extracting raw Sugar from the Beet- 

 root. By M. AcuARD 14 



V. An experimental Essay on Salt as a Manure, and as 

 a Cundiwent viixed with the FoodofAni7nals. By tht 

 Rev, KoMusiV Cartwright, of JFoburn .. .. 16 



VI. On the Analysis of Soils, as connected with their Jm- 

 provevient. By Humphry Daw, Esq. F.R.S. Pro- 

 fessor of Chemistry to the Board of Agriculture and to 



the Royal histitution 26 



VII. Extract frojn a Memoir on the Steeping of JVool, and 

 on the Influence of its different States on Dyeing. By 

 M. J. L. RoARD, Director vf the Dyeing Establishment 

 in the Imperial Alanufactories. Read in the French- Na- 

 tional Institute .42 



VIII. New Gahajiic Discoveries, by M. Ritter.' Ex- 

 tracted from a Letter from M. Chuist. Bernoulli 51 



IX. Galvanic Experiments. By M. Ritter . . . . 54 



X. Chemical Experiments on Mercury. By Messrs. 

 Braamcamp and SiauEiRA-OLiVA, of Portugal 56 



XI. New Method of preparing Alum from Pyrites and- 

 Clay. Br/ M. Lampadius, Professor of Chemistry and 

 Metallurgy at the School of Freyberg 65 



XII. Twenty-fourth Communication from Dr. Thornton, 

 relative to Pneumatic Medicine 68 



XIII. A spec fie Remedy for the Tinea Capitis. By Mr. 

 Jamks Baklow 69 



XIV. On the Decomposition of Alkaline Sulphurets by the 

 Oxides of Lead and of Manganese. By M. DizK 70 



XV. Process for preparing pure Gallic Acid. By M. RiCH- 



TER 74 



XVI. Biographical Sketch of Mr. George Maugets, 

 Chro?iometer-maker to the East hidia Company, and 

 Author of the Longitude and Horary Tables .. .. 76 



XVII. Acidulation of Sulphate of Polaoh. By M. Oer- 

 sted sy 



Vol. 23. No. 92. Jan. I8OC. a 



