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NATURE 
[June 25, 1914 
DIARY OF SOCIETIES. 
THURSDAY, June 25. 
Roya. Socirty, at 4.30.—The Spectrum of Elementary Silicon: Sir W. 
Crookes —Note on Mr. Mallock’s Observations on Intermittent Vision : 
Prof. S. P. Thompson.—Attempts to Produce the Rare Gases by Electric 
Discharge : [. R. Merton.—The Analysis of Gases after Passage of Elec- 
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Gold: C. T. Heycock and F. H. Neville.—The Variation of Electrical 
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G. M. Green.—The Potential of Ellipsoidal Bodies and the Figures of 
Equilibrium of Rotating Liquid Masses: J Jeans.— the Twenty- 
seven-Day Period in Magnetic Phenomena: Dr. C. Chree.—Electrifica- 
tion of Water by Splashing and Spraying: J. J. Nolan.—Effect of Pressure 
upon Arc Spectra. V.: W. G. Duffield.—Measurement of Alternating 
Electric Current of High Frequency: A. Campbell and D. 
And other Papers. 
FRIDAY, June 76. 
Puysicar Society, at 5.—Atmospheric Refraction and its Bearing on the 
Transmission of Electromagnetic Waves Round the Earth’s Surface : 
Prof. J. A. Fleming.—Atmospheric Electricity Observations made at Kew 
Observatory : G. Dobson.—Thermal and Electrical Conductivities of some 
of the Rarer Metals and Alloys: T. Barratt.—‘The Measurement of the 
Temperature Coefficient of Young’s Modulus for Metallic Wires, with 
Special Application to Nickel: Prof. E. P. Harrison—Some Investiga- 
tions on the Arc as a Generator of High Frequency Oscillations: F. 
Mercer, 
W. Dye.— 
THURSDAY, Jury 2. “ 
Royat GEOGRAPHICAL SOCIETY, at 5.—Lithological Map of the British 
Isles: Alan G. Ogilvie. 
CONTENTS. PAGE 
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