[ viii ] 



XVI. On the Gas Voltaic Battery. — Voltaic Action of Phosphorus, Sulphur and 

 Hydrocarhms. By W. R. Grove, Esq., M.A., F.R.S., VP.R.L, Prof. Exp. 

 Phil., London Institution 351 



XVII. On the Compounds of Tin and Iodine. By Thomas H. Henry, Esq. Commu- 

 nicated by R. Phillips, Esq., F.R.S 363 



Index 369 



Appendix. 

 Presents , [ ^ ] 



