CONTENTS. 



MEMOIRS. PAGE 

 On the Occurrence of Tracheliiun ccertdeitiu (Linn.) in Guernsey. By 

 James Cosmo Melvill, M. A., F.L..S 7 



The Marine MoUusca of Bombay. By James Cosmo Melvill, M.A,, 



F.L.S., and Alexander Abercromi!IE ... ... ... ... 17 



Descriptions of Twenty-five New Species of Marine Shells from Bombay. 

 Collected by Alexander Abercrombie, Esq. With Plate. By 

 James Cos.MO Melvtll, M.A., F.L.S. 52 



On a Method of Integration applicable to certain partial Differential 



Equations. By James Bottomley, D.Sc. &c 78 



General, Morphological, and Histological Inde.x to the Author's Collective 

 Memoirs on the Fossil Plants of the Coal Measures. Part II. By 

 William Crawford Williamson, LL.D., F.R.S., Foreign 

 Member of the Royal Swedish Academy ; Corresponding Member 

 of the Royal Society of Gottingen, &c., &c. ... ... ... ... 91 



The Rate of E.xplosions iu Gases. By Harold B. Dixon, M.A., F. R.S., 



Professor of Chemistry in the Owens College ... ... ... ... 128 



Comparison of Observations of Temperature taken at two stations in 

 Manchester from December 4th, 1S92, to January 28th, 1893. By 

 J. Wilson. Communicated by Arthur Schuster, Ph.D., F.R.S., 

 F.R.A.S 160 



Note on the previous paper. By Arthur Schuster, Ph.D., F.R.S., 



F.R.A.S 166 



On the Length of Flame produced by the Explosion of Gases in Tubes. 

 By B. Lean, B.Sc, Dalton Chemical Scholar; and H. B. Dixon, 

 M. A., F.R.S., Professor of Chemistry in the Owens College ... 169 



On some Remarks by the Right Honourable William Ewart Gladstone, 

 M. P., on the relative stability of Gold and Silver as Standards of 

 Value ; being a vindication of the opinions of Ricardo and Cobden. 

 By F. J. Faraday, F.L.S., F.S.S 178 



Memoir of the late Carl Schorlemmer, LL.D., F.R.S., F.C.S. By 

 Harold B. Dixon, M.A., F.R.S., Professor of Chemistry at the 

 Owens College ... ... ... ... 191 



Some recent developments in the application of Salts of Iron to the 



Purification of Sewage. By Harry Grimshaw, F.C.S 199 



Notes on a small collection of Plants, collected in S. W. Colorado by 

 Mr. J. Cardwell Lees. By James Cosmo Melvill, M.A., F.L.S. 214 



