CONTENTS. 



MliTEOBOLOGr &C. 



Page 

 Dr. William B. Carpenteh on the Undercurrents of the Bosphorus and 

 Dardanelles 41 



IMr. W. S. Davis on the Refraction of Liquid Waves 43 



Mr. J. Park Harimson on Lunar Influence on Clouds and Rain 43 



M. AsTUUo DE Marcoartu on the Application of Telegraphy to Navigation 

 and Meteorology 43 



Mr. C. Meldrum on a Periodicity of Cyclones and Rainfall in connexion 

 with the Sun-spot Periodicity 43 



Mr. S. B. J. Skertchly on Experiments on Evaporation and Temperaturo 

 made at Wisbeach 44 



3Ir. G. M. Whipple on the Passage of Squalls across the British Isles 44 



Iksteuments. 



Dr. Robert Stawell Ball on Dynamometers in Absolute Measure 44 



Captain J. E. Davis on an Improvement in the Sextant 44 



Mr. A. E. DoNKiN on an Instrument for the Composition of two Harmonic 

 Curves 4,5 



Mr. Rogers Field on an Improved Form of Aneroid for determining Heights, 



with a means of adjusting the Altitude-scale for various Temperatures 40 



Mr. G. W. Hope on Eckhold's Omnimeter, a new Surveying-Instrument 47 



Mr. G. J. Symons on Negretti and Zambra's Test-gauge Solar-Radiation 

 Thermometer 47 



Mr. S. C. TisLEY on a Compound-Pendulum Apparatus 48 



Professor A. S. IIerschel on a new form of Pendulum for exhibiting Super- 

 posed Vibrations 43 



Mr. F. _H. Wenham on the Influence of Temperature on the Elastic Force of 

 certain forms of Springs 49 



Mr. G. M. Whipple on a New Form of Rutherford's Minimum Thermometer, 

 devised and constructed by Mr. James Hicks : . . . 50 



on a New Electrical Anemograph 50 



Mr. C. J. WooBWARD on an improved form of Oxyhydrogeu Lantern for the 

 use of Lectui-ers 50 



CHEMISTRY. 



Address lay W. J. Russell, Ph.D., F.R.S., President of the Section 52 



Mr. Alfred H. Allen on the Detection of Adulteration of Tea 62 



Dr. Henry E. Armstrong on Alpha- and Beta-Naphthylic Sulphide 62 



] on the Action of Sulphuric acid on Ethylaniline 



and Dimethylaniline q.~> 



on Cresol Derivatives (33 



Professor Dr. Crum Brown on the Action of Sulphide of Methyl on Brom- 



acetic Acid po 



Dr. J. II. Gladstone on Black Deposits of Metals go 



Mr. A. Vernon Harcourt and F. W. Fison on a Continuous Process for 



Purifying Coal-gas and obtaining Sulphur and Ammonium Sulphate G4 



