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DIARY OF SOCIETIES. 
THURSDAY, Feprvary 1. 
Roya Society, at 4.30.—An Application of the Theory of Probabilities 
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Roya InstituTion, at 3.—The Mechanism of Chemical Change: Prof. 
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CHEMICAL Socigry, at 8—Chromium Phosphate: A. F; Joseph and 
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MATHEMATICAL SoGIETY,, at-5.30. ; } aah i 
LINNEAN Society, at 5.—Some Plants that might occur in Britain: C. E. 
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FRIDAY, Frsruary 2. 
Rovar Institution, ‘at 5.30.—Recent Physiology and the, War: Prof. 
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* SATURDAY, Fesrvary 3 
SEOLOGISTS’ ASSOCIATION, at 3.—President’s address: The Study of th 
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MONDAY, Feprvuary 5 
VAL SOCIETY OF ARTS, at °.—Town Planning ani vic Architecture ; 
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TUESDAY, Fepruary 6. 
Rovyat Institution, at 3.—The Old Brain and the New Brain, and their 
Meaning: Prof. C. S. Sherrington. 
NO. 2466, VoL. 98] 
NATURE 
[FEBRUARY I, 1917 
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parts of the Palemonid Prawns: L.'A. Borradaile.—Scolex in the 
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Beddard.—Report on the Deaths which saarred in the Zoological Gar- 
dens during 1916: Prof. H. G. Plimmer. 
RONTGEN SOCIETY, at_8.15.—Some Properties and Applications of 
Selenium: Dr, E. E, Fournier d’Albe. 
InstiruTION oF Civit ENGINEERS, at 5.30.—The Main Drainage System 
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WEDNESDAY, FeEsrvuary 7. 
Roya. Society or ARTS, at 4.30.—The Future of British Spas: Dr. R. F+ 
Fox. ‘ 
GEOLOGICAL SOCIETY, at 5.30. ’ 
ENTOMOLOGICAL SOCIETY, at 8 i 
Society or Pupiic ANnatysts, at 8.—The Quantitative Estimation of 
Mercury in Organic Compounds; J, E. Marsh and O. G. Lye.—The 
Shyewebury and Knapp Process for the Detection of Coconut Oil: G. D. 
Elsdon.—The Detection of Rose Petals in Blue Pill: W. Partridge. 
THURSDAY, Fesruary 8. 
Rovat Society, at 4.30.—Probable Papers: The Dynamics of Revolvin: 
Fluid : Lord Rayleigh.—Deflection of the Vertical by Tidal Loading o! 
the Earth's Surface: Prof. H. Lamb.—Spontaneous Generation of Heat 
in Recently Hardened Steel : C. F. Brush and Sir R. Hadfield. 
Roya InstiruTion, at 3.—The Mechanism of Chemical Change: Prof.~ 
F. G. Donnan, ’ 
INSTITUTION OF ELECTRICAL ENGINEERS, at 8.—Frequency Changers: 
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Optica Society, at 7.30 —Annual Meeting.—More Notes on Glass Grind- 
ing and Polishing: J. W. French. ‘ 
FRIDAY, FEBRUARY 9. 
RoyAt INSTITUTION, at 5.30.—Experimental Pnonetics and its Utility to 
the Linguist : D. Jones. , : 
Rovat ASTRONOMICAL SOCIETY, at 5.—Anniversary Meeting. 
Macaco.oaicat Society, at 7—-Annual Meeting. Presidential Address: 
Systematic List of the Marginellide: J. R. le B. Tomlin. 
CONTENTS. 
Oil-field Technology Jon ar SRT, Oe LA 
Arboreal Habits and the Evolution of Man, By 
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Meldola Memorial—The Committee . . 429 
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Sources of Nitrogen Compounds in the United 
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