CONTENTS. m 



XXI. Obfervatlons on the Redificatlon cf Nitric Acid, by Mr. Steinacher, 

 Druggift at Paris. ----- I34 



XXII. Eafy Method of making the very combuftible Oxide of Phofphorus. 

 By Amicws, -. - - - - - 135 



XXIII. J5eicriptiou of an extremely fenfible Micro ek6lrometer. By Mr. 

 Marechaux. - - - - - ib, 



XXIV. A6lioii of Phofphorus on the Solutions of Metals. By Mr. Schnaubert. 138 



XXV. Account of a new Pyrometer, which is capable of indicating degrees of 

 . Heat of a Furnace. By Mr. J. G. Schmidt, of YafTa, in Moldavia. From 



the Autlior. . - - - - - 141 



XXVI. Nev/, eafy, knd economical Method of feparating Copper from Silver. 

 ByMr. Gcettling. - - - - - 142 



Scientific News, 144. — Extrafl: of a Letter from Brugnatelli, concerning the 

 'Non-exiftencfe of the charged Pile, ib. 



JULY, 1805. 



JSngravIngs of the following Objects: 1. A Topographical Plan by Mr. 

 Churchman, in which the Elevations and DeprelFions of the Surface of the 

 Earth are by a new Method corre6lly delineated ; 2. Apparatus for meafuring 

 the Po.wei^ of Horfes, by Mr. Gregory; 3. The American Borer, or Inftru- 

 , ment for boring Holes in Wood, and clearing out the Cuttings during the 

 Time of Work; 4. Diagram illuitrative of Optics, by Mr. Ezekiel VV'aiker; 

 5. Mr. Seppings's Blocks for fupporting and fulJDerding Ships in liich a Man- 

 ' ne.r as to render it unneceflary to lift them for the Purpofe of Repair. 



I. Remarks on the Eftimation of the Strength of Horfes. In a Letter from 

 |Mr. O.Gregory, of the Royal Military Academy, Woolwich. Page 145 



11. 'An Account of feme Analytical Experiments on a Mineral Production 

 from Devonfhire confilling principally of Alumine and Water. By Humphry 

 Davy, Efc]. F. R. S. Profeflbr of Chemiftry in the Royal Inftitution. 

 From the Philofaphical Tranfaftions in 1805. - - 153 



IIJ. On the Aberrations of Light pafling through Lenfes. By Mr. Ezekiel 

 ''W'^lker. - - - - - - 159 



XV. New Method of decompofing the Sulphate of Barytes for preparing the 

 Muriate of that Earth, and Preparation of the Muriate. By Mr. Gocttling. JGI 



V. On the A6\ion of Platina and Mercury upon each other. By Richard 

 Chenevix, Efq. F. R. S. M. R. I. A. &c. From the Philofophical Tranf- 



' anions for 1805, p. 104. - - - -162 



VI. Method pf obviating the Necefiity of Lifting Ships. By Mr. Robert 

 Seppings, of Chatham Yard. - - - - 182 



VII. On myfcular Motion. By Anthony Carlifle, Efq. F. R. S. being the 

 Crooriian Leflure, read before ihe Royal Society, November 8, 1804. 189 



Vill. Defcription of a Boring Tube, in general Uie in America; but lefs 



known in this Country. ----- 202 

 IX- Gejographical and Topographical Improvements. By John Churchman, 



Efq. M.. Imp. Acad, of Sciences, Peterfburgh. - - ib. 



X« A Memoir on the refining of Lead in the large Way. Containing fome 



Jleflfe6lions on the Inconveniencies refulting from Cupels made of Afhes; 



with a new and ceconomical Method of conftru6lmg thele Cupels. By Cit. 



Duhamel. - - - - - - 206 



XI. Letter from Mr. James Stodart, explaining the Method of gilding upon 

 Steel by Immerfion in a Liquid, which has lately engaged the public Attfen- 

 tion in various Articles of Manufa6lure. - - - 215 



XII. On the peculiar Noife emitted by Water before it acquires the Tempera- 

 ture of boiling ; which is commonly denoted by the Word Simmering. 

 W.N. - - - - - - 216 



XIII. Experiments on Wootz. By Mr. David Mufhet. From the Philofo- 

 phical Tranfaaions, 1805. - - - - 221 



. AUGUST 



