VUl CONTENTS. 



M. F. Hofmann's Remarks on a new Telemeter ; a new Polaiimeter ; a new 



Polarizing Microscope ; and various Spectroscopes 27 



Mr. N, J. Holmes on the North Atlantic Telegraph 27 



Mr. J. T. Taylob on a Defect in the Demonstrating Polaiiscope, with a sim- 

 ple and effective Remedy 28 



CHEMISTET. 



Address by H. Bence Jones, A.M., M.D., F.R.S., President of the Section. . 28 



Dr. J. Attfield on the Assay of Coal, &c., for Crude Paraffin Oil, and of 

 Crude Oil and Petroleum for Spirit, Photogen, Lubricating Oil, and Pai-affin 83 



Dr. Baueb on the Action of Chlorine on Amylene 83 



Mr. Alfred Bird on the Purification of Terrestrial Drinking Waters with 

 Natural Sulphate of Alumina 83 



Dr. Cbace-Calvebt on the Oxidizing Action of Carbon 34 



Mr. William Cbookes on Disinfection 34 



Dr. Daubeny on Ozone 37 



Dr. J. H. Gladstone on the Refraction- and Dispersion-equivalents of Chlo- 

 rine, Bromine, and Iodine 37 



Mr. J. M. M'^Gauley on the Nature and Properties of Ozone and Antozoue 

 demonstrated experimentally 38 



Dr. H. Bence Jones on the Chemical Action of Medicines 38 



Mr. H. Lahkin on a Magnesium Lamp 40 



Drs. J. B. Lawes and J. H. Gilbert on the Accumidation of the Nitrogen 

 of Manure in the Soil 40 



on the Sources of the Fat of the Ani- 

 mal Body 41 



Dr. Stevenson Macadam on the Poisonous Nature of Crude Paraffin Oil, and 

 the Products of its Rectification upon Fish 41 



Dr. T. L. Phipson on an Extraordinary Iron Stone 43 



Dr. Lyon Playfaib on the Origin of Muscular Force in Animals 43 



Mr. Peteb Spf;NCE on a New Process in the Manufacture of White Lead . . 44 



Mr. C. ToMLiNSON on some Phenomena connected with the Melting and Soli- 

 difying of Wax 44 



Mr. J. F. Walker on a Phosphatic Deposit in the Lower Green Sand of Bed- 

 fordshire . . , 45 



Mr. Walter Weldon on a Proposed Use of Fluorine in the Manufacture of 

 Soda 45 



GEOLOGY. 



Address by Professor A. C. Ramsay, LL.D., F.R.S., &c., President of the 

 Section 4(i 



Professor Ansted on Intermittent discharges of Petroleum and large deposits 

 of Bitumen in the Valley of Pescara, Italy 50 



^— on a Salse or Mud Volcano on the flanks of Etna, commen- 

 cing to erupt in the month of January last 50 



Mr. C. Spence Bate on an Attempt to approximate the Date of the Flint Fl.Tkes 

 of Devon and Cornwall 50 



