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DIARY OF SOCIETIES. 
_ 
THURSDAY, DECEMEER 18. 
INSTITUTION OF ELECTRICAL ENGINEERS, at 8.—The Employment of 
Power in H.M. Post Office: H. C. Gunton. +: <a 
Rovat. GEOGRAPHICAL SOCIETY, at 5.—The Standardising of Colours and 
Symbols representing Geographical Data, especially on Small Scale Maps? 
Prof. A. J. Herbertson. ve: 
LinnEAN Society, at 8.—The Evolution of the Inflorescence: J. Parkin. 
—Hypericum desetangsii, Lamotte, a New British Plant: C. E. Salmon. 
—The Mouth-parts and Mechanism of Sucking in Schizoneura lanigera: 
J. Davidson. * 2 
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INSTITUTE OF ACTUARIES, at 
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CONTENTS. PAGE 
Principles of Mathematics .......... + + 445 
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GurBookshelf « 2: 1 .92es sneer oto eae 
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Reflection of Light at the Confines of a Diffusing 
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The Pressure of Radiation. —Prof. H. L. Callendar, 
‘Transparent Grating: an Analogy to the Reflection 
of X-Rays from Crystals. (W2th Diagram.)— 
Prof. Carl Barus 
Fractured Flints from Selsey. —Sir E. Ray Lankester, 
K.C.B., F.R.S.; Prof. W. J. Sollas, F.R.S. 
The Structure of the Atom,—Frederick Soddy, 
R 
cieties. By Sir William Ramsay, K.C.B., F.R.S. 
Healthin India. BySir Ronald Ross, K.C.B., F.R.S. 
The Problem of the University of London. . . . 
A Refraction Acting Radially fromthe Sun... . 
Researches at the Allegheny Observatory .... . 
Zodiacal Matter and the Solar Constant ...... 
The Physical Society’s Exhibition i 
Third International Congress of Tropical Agricul- 
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Physical Chemistry of Solutions 
Physiology atthe British Association. By Dr. H, E. 
Roath se...) .. 2 ae ee 
Geodetic Observations and Their Value, By Sir 
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