X CONTENTS. 



Page 

 Mr. Patrick Adie's Description of a New Reflecting Instrument for Angular 

 Measurement '69 



M. E. Becquerel on a Pile with Sulphate of Lead 59 



The Hon. W. Bland on an Atmotic Ship 60 



Rev. J. Booth on an Improved Instrument for describing Spirals, invented by 

 Henry Johnson 60 



Mr. A. Claudet on the Means of increasing the Angle of Binocular Instru- 

 ments, in order to obtain a Stereoscopic Effect in proportion to their Mag- 

 nifying Power 61 



on the Principles of the Solar Camera 62 



Mr. Henry Draper on a Reflecting Telescope for Celestial Photography, 

 erecting at Hastings, near New York 63 



Mr. W. Ladd on an Improved Form of Air-Pump for Philosophical Experi- 

 ments 65 



Mr. John Smith on the Chromoscope 65 



CHEMISTRY. 



Professor Andrews on Ozone 66 



Dr. Bird on the Deodorization of Sewage 66 



Professor B. C. Bkodie on the Quantitative Estimation of the Peroxide of 



Hydrogen 66 



Mr. G. B. Buckton on some Reactions of Zinc-Ethyl 66 



Mr. J. J. Coleman's Note on the Destruction of the Bitter Principle of Chy- 



raitta by the Agency of Caustic Alkali 66 



■ on some remarkable Relations existing between the 



Atomic Weights, Atomic Volumes, and Properties of the Chemical Elements 66 



Dr. Frankland and B. Duppa on a new Organic Compound containing Boron 69 



Dr. Gladstone's Chemical Notes 69 



Mr. W. R. Grove on the Transmission of Electrolysis across Glass 69 



Mr. A. Vernon Harcocrt on the Oxidation of Potassium and Sodium 70 



Mr. J. B. Lawes and Dr. J. H. Gilbert on the Composition of the Ash of 



Wheat grown under various circumstances 70 



Professor W. A. Miller on the Atomic Weight of Oxygen 70 



C. Moritz von Boss's Remarks on the Volume Theory 71 



Mr. Warren De la Rle and Dr. Hugo Muller on a New Acetic Ether 



occurring in a Natural Resin 71 



. on the Isomers of Curnol 71 



Dr. Lyon Playfair on the Representation of Neutral Salts on the type of a 



Neutral Peroxide H0 2 instead of a Basic Oxide H 2 2 71 



Professor T. H. Rowney on the Analysis of some Connemara Minerals 71 



on the Composition of Jet 72 



Mr. T. Scoffern on Waterproof and Unalterable Small-arm Cartridges 72 



Dr. Hermann Sprengel on a New Form of Blowpipe for Laboratory Use... 72 



Dr. Thudichum on Thiotherine, a Sulphuretted Product of Decomposition of 



Albuminous Substances 72 



Professor Voelcker on the Occurrence of Poisonous Metals in Cheese 73 



Dr. W. Wallace on the Causes of Fire in Turkev-red Stoves 73 



