Voh.Go. 



Philosopliical Magazine., Skpt. 1822. 



Contents of Number 293. 



XXVI. On the Origin and Discovery of Iron. By David 

 I MusiiF.r, Esq P^ge 161 



XXVII. Suggestions for simplifying Mr. Ivory's Solution 

 of the Double Altitude Problem. By Mr. Edward Riddle, 

 Royal Naval Asylun), Greenwich 167 j 



XXVIII. On the Relation of Acids and Alkalis to Vege- 

 I table Colours, and their Mutations thereby. By John Mur- 

 ' RAY, F.L.S. M.G.S. M.W.S. &c. &c 170 i 



XXIX. New Demonstrations of the Method invented by 

 Budan, and improved by others, of extracting the Roots of 

 Equations. By Mr. Pkter Nicholso.v. , 173| 



XXX. On the Electrical Phaenoraena exhibited in Vacuo. 

 [By Sir Humphry Davy, Bart. P.R.S 179"; 



XXXI. On Mr. John Moore Junior's " Reply." 186 



XXXII. On the Causes of a singular partial Failure in a 

 Crop of Turnips. By Mr. Samuel Taylor, of Bungay... 187 1 



XXXIII. On the Stars forming the Pleiades. By Francis 

 \ Baily, Esq 189 



XXXIV. Reply to Dr. Apjohn's "Additional Remarks," 

 &c. in The Annals of PliUosophy for September 182^. By 

 John Herapath, Esq. 193j 



XXXV. On simultaneous Thunder- Storms. By Dr. 

 I T. FORSTER 195 



XXXVI. Remarks respecting Astronomical Observatories. 197 j 



XXXVII. A Letter to Professor Millington, of the 

 Royal Institutfon, respecting some Frigorific Experiments 

 made on the Magnetic Fluid, and on Sea-Water, By 

 B. De Sanctis, M.D 199' 



XXXVIII. On Lithographic Printing. By Mr.WiLLiCH. 206 i 



XXXIX. Short Account of the Rocks in the Neighbour- 

 hood of St. John's, Newfoundland. By Mr. John Baird. 206 



XL. Reply to Captain Forman's "Theory of the Tides. 



By Mr. Henry Rt ssELL 2105 



XLI. Notices respecting New Books 211 



XLII. Proceedii>gs of Learned Societies 229 i 



XLIII. Intelligence and Miscellaneous Articles :— Arti- 

 ficial Formation of the Formic Acid. — Electrical Conductorar 

 for Ships. — Black Sand of Cayenne. — Ornithology of Ice- 

 jland. — Number of Plants cultivated in Britain — Earthquake 



'in the North of England Capt. Scoresby's Discoveries in 



Greenland. — Russian Voyage of Discovery. — Junction of 

 the American Lakes with the Atlantic Ocean. — Wool em- 

 j)loyed in the Manufactures of France. — Palm-tree Cordage. 

 (Change of Colour in a Negro.--OBiTUARY;— Sir William 

 I llcrschel. — M. Delambre.— Lectures. — Patents. — Meteo- 

 rological Table. - 230-240 ' 



RICHARD AND ARTHUR TAYLOR, PRINTERS, SHOE LANB, LOWDON. 



