VI CONTENTS. 



Page 

 Mr. A. Catton on the Connexion between the Form and Optical Properties 

 of Crystals 10 



Mr. A. Claudet on Photo-Sculpture 10 



Mr. J. P. Gassiot on the Adaptation of Bisulphide-of-Carbon Prisms, and the 

 use of Telescopes of Long Focal Distance, m the Examination of the Sun's 

 Spectrum 11 



Dr. Gladstone on the Transmission of the Red Ray by many Coloured Solu- 

 tions 11 



Professor W. A. Millek and Mr. W. Huggins on the Spectra of some of the 

 Heavenly Bodies 12 



Mr. J. J. Walker on a recent Description of an Iris seen in the Lake of 

 Lucerne 13 



Electeicitt. 



Mr. Samuel Highley's Description of a Cheap Form of Automatic Regulator 

 for the Electric Light 13 



Mr. Fleeming Jenkin on the Retardation of Electrical Signals on Land- 

 Lines 13 



's Description of an Electric-resistance Balance constructed 



by Prof. W. Thomson 14 



Mr. II. Keevil on the Development of Electricity from the Rays of the Sun 

 and other Sources of Light 14 



Professor H. D. Rogers's Descriptions of the " Liquid Steering Compass " and 

 " Monitor Compass " 14 



Mr. J. B. Thompson on the Mechanical Theory and Application of the Laws of 

 Magnetic Induction and Electricity 15 



Meteoeologt. 



Mr. C. O. F. Cator on a New Anemometer 16 



Rev. E. B. Ellmar on the Earthquake and Storm in Sussex of 21st August 

 1864 16 



Mr. John Hartnup's Diagram of the Great Storm of December 3, 1863, 

 from the records of the. self- registering Instruments of the Liverpool Obser- 

 vatory 17 



Professor Hennessy on the Regression of Temperature during the Month of 

 May 17 



Rev. L. Jenyns on the Temperature and Rainfall at Bath 17 



Mechanics, etc. 



Mr. R. A. Peacock's New Foi-mula for calculating Steam Pressures, Steam 



and Voleanos, Bursting of Boilers 19 



Professor W. J. Macquorn Rankine on the Properties of certain Stream- 

 lines 20 



Dr. J. Stevelly on a Mode.of Determining the Velocity of Sound 20 



Mr. C. ToMLiNSON on the Cohesion-Figures of Liquids 21 



