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Contents of PROCEEDINGS, No. A542. June,1908. ~ 
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; _ Page AG 
ON THE MEASUREMENT OF THE ATMOSPHERIC ELECTRIC ‘ 
POTENTIAL GRADIENT AND THE EARTH-AIR CURRENT. By C. T. R. Witson, F.R.S. <2 DOE ‘% 
ON THE HYSTERESIS LOSS AND OTHER PROPERTIES OF IRON ae 
ALLOYS UNDER VERY SMALL ioe anal ae FORCES. By, Professor Ernest Wixtson, V. H. se 
Wiwson, and G. F. O’DELL Ni: 598 BE. 
NOTE ONcTHE REPRESENTATION OF THE EARTH’S SURFACE BY 
HES: OF SPHERICAL HARMONICS OF THE FIRST THREE DEGREES. = A. E. H. Love, 
THE RELATION BETWEEN THE. CRYSTALLINE FORM AND ‘THE 
CHEMICAL CONSTITUTION OF THE PICRYL DERIVATIVES. By GEORGE jE and 
WILLIAM JacKsON Pops, F.R.S. ; 
A PHOTOGRAPHIC DETERMINATION OF THE ELEMENTS OF THE 
ORBITS OF JUPITER’S SATELLITES. By Bryan Cooxson, M.A. .. 
HELIUM AND RADIO-ACTIVITY IN RARE AND COMMON. MINERALS. 
By the Hon. ’R: J; Sreupe Fk RS: 
; Be ee OF A CROSS WIND ON RIFLED PROJECTILES. By A. ‘MaLiock, 
ON THE DECAY OF THE RADIUM EMANATION WHEN DISSOLVED IN 
WATER. By RicHarp B. Moors, B.Sc. 
PERCENTAGE OF THE INACTIVE GASES IN THE ATMOSPHERE : A 
CORRECTION TO PREVIOUS CALCULATIONS. By Sir WiLt1Am Ramsay, i SS 
ONE E WE queue ee Ay EG Cas, SIE Ek El ee 
TITLE, CONTENTS, ETC. | 
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