[ xii ] 
VIII. Further 'particulars of the Fall of the Cold Bokheveld Meteorolite. By Thomas 
Maclear, Esq. F.R.S. 8$c., in a Letter to Sir John F. W. Herschel, Bart. 
K.H. V.P.R.S. See. 8$c. Communicated by Sir John F. W. Herschel . 177 
IX. An account of Experiments made ivith the view of ascertaining the possibility of 
obtaining a Spark before the Circuit of the Voltaic Battery is completed. By 
John P. Gassiot, Esq. Communicated by P. M. Roget, 31. D. Sec. R.S. fyc. 183 
X. Researches in Physical Geology. — Second Series. By W. Hopkins, Esq. M.A. 
F.R.S. , Fellow of the Royal Astronomical Society , of the Geological Society, 
and of the Cambridge Philosophical Society 193 
XI. Second Letter on the Electrolysis of Secondary Compounds. Addressed to 
Michael Faraday, Esq. D.C.L. F.R.S., Fullerian Prof. Chem. Royal Insti- 
tution, fyc. 8fc. fyc. By J. Frederic Daniell, Esq. F.R.S. For. Sec. R.S., 
Prof. Chem. in King's College, London 209 
