CONTENTS of N c 234.— Fourth Series. 



I. On the Theory of Phlogiston. By George Farrer Rodwell, 

 F.C.S * page 1 



II. Contributions to the Mineralogy of Nova Scotia. By Professor 

 How, D.C.L., University of King's College, Windsor, Nova Scotia . . 32 



III. Acoustic Experiments. By A. Kundt 41 



IV. On certain Lecture-Experiments, and on a New Form of Eudio- 

 teter. By Josiah P. Cooke, Jun., of Harvard College 48 



V. On a remarkable Phenomenon observed at Rangoon. By Dr. C. 

 Collingwood, F.L.S 61 



VI. On a Uniform-Electric-Current Accumulator. By Sir Wil- 

 liam Thomson, LL.D., F.R.S 62 



VII. On Volta- Convection by Flame. By Sir William Thomson, 

 LL.D.,F.R.S 64 



VIII. On Electric Machines founded on Induction and Convection. 

 By Sir William Thomson, LL.D., F.R.S 66 



IX. Notices respecting New Books : — Sound. A Course of Eight 

 Lectures delivered at the Royal Institution of Great Britain. By John 

 Tyndall, LL.D., F.R.S 73 



X. Intelligence and Miscellaneous Articles : — 



On a New Photometer, by C. H. Bennington, M.A. Cantab 78 



New Observations on the Spectra of the Fixed Stars, by Father 



Secchi , 78 



*** It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



