Vol, 49. Philosophical Magjtzine. March 181* 



Contents of Number 227. 



^j5« XL. On the Agency of the Carbonate of Magnesia in \rt-Page. 

 jja proving Bread made from the new Flour. By Et>mond 

 IflDAVY, Esq. Professor of Chemistry and Secretary to the 

 ^ CorV Institution - - -- -„- 



XLI. On alloyipg Irop witii Manganese. By Datid 

 ii Mu3HF.TT, Esq. of Coleford, Forest of Dean - . . 



ij^ XLII. Metliod of preparing Lime, so as to preserve il 

 for a long Time always ready for Mortar or Whitewash' - 



XLin. Observations on the Changes produced in the new 

 Wheat ; and on the Means of improving the Flour. By Ed- 

 MUNo Davy, Esqj Professor ot' Chemistry and fecretary to 

 the Cork Institution ~- .... .. 



XLIV. N.*w Theorems for detf^rmining the Rate of J^n- 

 terest, and the Value of increasing Annuities, See. 



XLV. Some Account of the Solar Spots which appearO^^ «Lt 

 ; during the Year IS 16 - - - - - ,- ISSJ^,^ 



ILVL "Improvement on the Sliding- Rule. By Sylv 

 jvANUi Bevan', Esq. - - - - ... 



XLVIL Some ilsmavks upon an urinary Calculus hav- 

 ing a Cinder as its Nucleus ; with a Notice of other Qalculi 

 containing a small Quantity of Carbonate of Linle. The 

 OccurrenQe also of Brown Spar, noticed in the Trap Rocjc 

 .near N«jwport in Gloucestershire , -- . . " - 



XLVI 1 1. Abstract of *• lastruction'conceming the making 

 'of Bread from damaged Corn" -_ - ,- - .; 19I 

 XLIX. On Aerial' Navigation. By A CacaESPONnENT.MS? 

 L. Queries on Steam-Boats'. By Mr. Gborge Rennie 200 

 L'l. On Mr. Horn's Theory of Vision -' -; --.; 202 



LI I. Letter from Mr.G. Stephenson of the Killingworth 

 I Colliery: — with a few Remirks on his Ciaiih to Priority in 

 the Invention of the S;ife4amp, by the Editor , - , - £04 

 \JMt LI 1 1. Answer to some gf the Geological Queries in otir ■^\ 

 4^ lp.st Number. By N. J. W. Esq. - -. . , — .J' 



^^^ LIV. On the supposed Repulsion of Electricity^' - ' - 

 " iJU LV. On the fixed QU of Winft ; and "on the Light emitted 

 ^f by metallic Wirci of low Teniperatufe in certain volatile 

 ^ Media. By Mr. J. Farlex - - - - r - 20S> 



i{UW|> LVI. Remarks on Mr! Frend's "Eveniug Amuse,ments 

 ^^"^BytheRev.T.DRUMMOND - - - - - SJO^f 



I LVI I. On the Exhibition and Harmonic Effects of the 

 10 Rev. Mr.LisTON'sEuharmonic Oi-gan. - ' - - 21S ' 



LVIII. Nrtice on the Origin and Practice of the new In 

 ^ventJon of Lithography . • . . _ . . 215 j 



LIX. Notices respecung New Books - - > 2181 



LX. Proceedings of Learned Societies - - » 220 

 LXI. Intelligence and Hiscellaneous Article? :—SnSike 

 "found in a Block of Coal^-Steam Engines in Cornwall — Pas- 

 ;C0 Silver Mines — Experiment on discoloured Barley — The 

 'ebbin? and flowing Stream at Bridlington — Architectiire— 

 L African Expedition — Vaccination — Ship-Pumps — Stearo- 

 JBoats— A Caution — Botany — Edinburgh Rain Gauges — 

 Patents— Astronomy — Meteor'^logy. .- -„_ ' 227 --24 



RJCHARD AND A&THgR TAYtOK; PM«TK&8| SHOU 1.tkVZtl.in^g^j^ 



