[ Vi ] 
VIII. On a simple Electro-chemical Method of Ascertaining the Presence of 
different Metals, applied to detect minute quantities of Metallic Poisons . 
By Edmund Davy, F.R.S. M.R.I.A. 8fc. Professor to the Royal Dublin 
Society page 147 
IX. On the Chemical Action of Atmospheric Electricity. By Alexander 
Barry, Esq. F.L.S. Communicated by John George Children, Esq. 
Sec. R.S., fyc. 8$c 165 
X. An Account of Operations carried on for ascertaining the Difference of Level 
between the River Thames at London Bridge and the Sea ; and also for 
determining the Height above the Level of the Sea, 8$c. of intermediate 
Points passed over between Sheerness and London Bridge. By John 
Augustus Lloyd, Esq. F.R.S. F.R.G.S. &; F.S.A 167 
XI. On the Variable Intensity of Terrestrial Magnetism, and the Influence of 
the Aurora Borealis upon it. By Robert Were Fox. Communicated 
by Davies Gilbert, Esq. M.P. V.P.R.S. 199 
XII. Description of a Graphical Registrar of Tides and IVinds. By Henry 
R. Palmer, Civil Engineer. Communicated by John William Lubbock, 
Esq. V.P. and Treas. R.S. 209 
XIII. On the Errors in the Course of V essels, occasioned by Local Attraction ; 
with some Remarks on the recent Loss of His Majesty’s ship Thetis. By 
Peter Barlow, Esq. F.R.S. Cor. Mem. of the Inst. France, Imp. Acad. 
Sciences St. Petersburgh, Acad. Sciences Brussels, fyc. 8fc. . . . 215 
XIV. On the Meteorological Observations made at the Apartments of the Royal 
Society, during the Years 1827, 1828, and 1829. By J. W. Lubbock, 
Esq. V. P. and Treas. R.S. 223 
Appendix. 
Meteorological Journal kept at the Apartments of the Royal Society, by order 
of the President and Council. 
