contents. ^ 



Electbicitt. 



Page 



Professor G. C. Foster's Description of some Lecture-experiments in Elec- ^^ 

 tricity j- 



Mr. J. P. Gassiot on the MetaUic Deposit obtained from the Induction-dis- ^^ 

 charge in Vacuum-Tubes 



The Hon. J. W. Strutt on an Electromagnetic Experiment 46 



Mr. F. H. Varley on the Electric Balance 



Mr. Thomas T. P. Bruce Warren on Electrification 47 



Instritments. 



Mr. A. E. Fletcher on a new Anemometer for Measuring the Speed of Air 



in Flues and Chimneys 



Mr. F. Martin's Description of a New Self-recording Aneroid Barometer . . 51 

 Mr. Frederick T. Mott on the Maury Barometer, a new Instrument for ^^ 



Measuring Altitudes 



Dr. Balfour Stewart on a Self-recording Rain-gauge 52 



Mr. G. Johnstone Stoney on ColUmators for adjusting Newtonian Telescopes 52 



. on a cheap form of Heliostat 53 



Lieut -Colonel A. Strange on the best Forms of Numerical Figures for Scien- 



tific Listruments, and a proposed Mode of Engraving them b6 



Mr. E. VivL\N on Self-registeiing Hygrometers 5-3 



Mr. T. Warner on Chambered Spirit-levels S4 



Mr. C. J. Woodward on a Self-setting Type Machine for recording the Houriy 



Horizontal Motion of Air ^4 



CHEMISTET, 



Address by H. Debus, Ph.D., F.R.S., President of the Section 54 



Dr. Thomas Andrews on the Absorption-bands of Bile 59 



Mr. Henry K. Bamber on the Water Supplies of Plymouth, Devonport, 



' Exeter, and St. Thomas ^ 



Mr I LowTHiAN Bell on the Decomposition of Carbonic Oxide by Spongy 



■ Iron ; ^2 



Mr. Frederick Braby on Extraction of Ammonia from Gas-Liquor (j3 



Dr H. Cook on the Registration of Atmospheric Ozone in the Bombay Presi- 

 dency, and the chief Causes which influence its appreciable amount in the 



Atmosphere 



Professor F. Crace-Calvert on the Amount of Soluble and Insoluble Phos- 

 phates in Wheat-Seed ^'^ 



Mr. J. Dewar and G. Cranston on some Reactions of Chloro-Sulphiuic Acid 07 



Mr. D. Fritsche's Notes on Structural Change in Block Tin 67 



M. H. M. Jacobi on the Electro-deposition of Iron 67 



Dr. Janssen sur le Spectre de la vapeur d'eau 67 



Note sur ime nouvelle Mi^thode pour la recherche de la Soude 



et des composes du Sodium par I'Analyse Spectrale 68 



The Rev. Professor Jellett on a Method of determining with accuracy the 



Ratio of the Rotating Power of Cane-sugar and Inverted Sugar 69 



