vJii CONTENTS. 



vm Page 



Dr. S. Macadam on the Analysis and Valuation of Manures 72 



Rev Dr Macvicar on the Organic Molecules and their relations to each 

 other and to the Medium of Light, illustrated by Models according to the 



Author's Theory of the Forms and Structures of the Molecules of Bodies.... 72 



Mr. J. M c Donnell on the Action of Air on Alkaline Arsenites 74 



Abbe" Moigxo on Corne and Demeaux's Disinfecting and Deodorizing Powder 74 



. on Matches without Phosphorus or Poison 74 



t New Process of Preserving Milk perfectly pure in the Natural 



State, without any Chemical Agent 74 



Messrs. Mulligan and Bowling's Quantitative Estimation of Tannin in some 



Tanning Materials 75 



Dr. W. Odling on Marsh's Test for Arsenic 75 



and Dr. A. Dupre on the Composition of Thames Water 75 



on a New Mode of Bread-making 76 



Dr. T. L. Phipson on some New Cases of Phosphorescence by Heat 76 



on the Composition of the Shell of Cai-dium edule (Common 



Cockle) 7 ? 



on the Composition of a recently-formed Rock on the Coast 



of Flanders W 



Mr. Frederick Ransome on Soluble Silicates, and some of their Applications 78 

 M. Thomas Segelcke's Notes on the Current Methods for Estimating the Cel- 

 lular Matter, or "Woody-Fibre," in Vegetable Food-stuffs 79 



Mr. Thomas Spencer on the Supply and Purification of Water 83 



Professor J. Tennant's Notes on a Gold Nugget from Australia 85 



M. F. Versmann and Dr. A. Oppenheim on the Comparative Value of cer- 

 tain Salts for rendering Fibrous Substances Non-inflammable 86 



Professor Voelcker on Combinations of Earthy Phosphates with Alkalies .... 88 

 Dr. W. Wallace, Account of Experiments on the Equivalent of Bromine ... 88 

 on Proposed Improvements in the Manufacture of Kelp .... 88 



Mr. Napier's New Process of Etching Glass in relief by Hydrofluoric Acid. 



(Communicated by Professor G. Wilson) 88 



Professor George Wilson on some of the Stages which led to the Invention 



of the Modern Air-pump 89 



GEOLOGY. 



Introductory Address by the President, Sir C. Lyell 93 



Sir Charles Lyell on the Occurrence of Works of Human Art in Post- plio- 

 cene Deposits 93 



Rev. Dr. Anderson on Human Remains in Superficial Drift 95 



— '■ ■ on Dura Den Sandstone 97 



Mr. W. H. Baily on Tertiary Fossils of India 97 



jr- = ■ on Sphenoptcris Hooheri, a new Fossil Fern from the Upper 



Old Red Sandstone formation at Kiltorkan Hill, in the County of Kilkenny, 

 with some Observations upon the Fish Remains and other associated Fossils 



from the same locality 98 



Mr. William Beattie, Notice of a Bone Cave near Montrose 99 



Dr. Bialloblotzky on Granite 100 



Dr. Black on Coal at Ambisheg, Isle of Bute 100 



