vi CONTENTS. 



Page 



Mr. H. Whiteside Cook on certaiu Objections to the Dynamic Theory of 



Heat "... 38 



Dr. Henby Hudson ou the Wave Theory of Light, Heat, &c 39 



Optics. 



Dr. John Bakkeii on the Immersion Slcthod of Illumination of the Micro- 

 scope 39 



Mr. S. Holmes on the New Binocular Microscope 39 



Prof. J. Clerk Maxwell on Colour- vision at different points of the Retina. . 40 

 Mr. G. Johnstone Stoney on the Cause of the Interrupted Spectra of 



Gases ' 4 1 



The Hon. J. W. Strutt's Experiments on Colour 4.*] 



31r. W. M. Watts on two Spectra of Carbon existing at the same Temperature 41 



CHEMISTRY. 



Address by Professor Henry E. IIoscoe, B.A., Ph.D., F.R.S., F.C.S., Presi- 

 dent of the Section 41 



Mr. J. Fenwick Allen on the Alloys of Copper, Tin, Zinc, Lead, and other 

 Metals with Manganese &0 



Mr. J. Campbell Brown on the Chemical Composition of the Bones of 

 General Paralytics 51 



Mr. John Browning on a Spectroscope in which the Prisms are automatically 

 adjusted for the Minimum Angle of Deviation for the particular Ray 

 im'der examination ^'2 



Mr. W. Lant Carpenter on the Examination of Sea Water on board 

 H.M.S. ' Porfupine,' iu July 1870, for dissolving Gases and varying pro- 

 portions of Chlorine C-T 



]Mr. A. H. Church's Contributions to Mineralogical Chemistry 5.3 



Experiments on the Presenation of Stone 5.j 



Mr. W. J. Cooper on the Purification of Public Thoroughfares by the appli- 

 cation of Deliquescent Chlorides 5.'? 



Mr. Henby Deacon on a new Chlorine Process without Manganese 54 



Mr. James Dewar's Note on Thermal Equivalents. — 1. Fermentation. 

 2. Oxides of Chlorine 54 



Mr. Thomas Fairley on Cyanogen 54 



. 's Note on the Ilistillation of Sulphuric Acid 55 



Mr. Alfred E. Fletcher on the Purification of Sankey Brook 55 



on Air-pollution from Chemical Works 50 



Mr. David Forres on the Utilization of Sewage, with special reference to the 

 Phosphate Process 50 



Dr. B. W. Gerland on the Action of Sulphurous Acid, in Aqueous Solution, 

 on Phosphates and other Compounds 50 



's Note on the Occurrence of Vanadium 57 



Dr. John H. Gladstone on Reciprocal Decomposition viewed with reference 

 to Time 57 



Mr. W. Gossage on the Soda Manufacture 53 



Mr. A. Vernon Harcourt on a Method for the Determination of Sulphur 

 in Coal-gas 50 



