MONOGRAPHS ON PHYSICS 
EDITED BY 
Sir J. J. THOMSON, O.M., F.R.S. 
AND 
FRANK HORTON, D.Sc., M.A. 
of the Cavendish Laboratory, Cambridge 
8vo. 
RAYS OF POSITIVE ELECTRICITY AND THEIR AP- 
PLICATION TO CHEMICAL ANALYSIS. By Sir J. J. 
THomson, O.M., F.R.S. 5s. net. [In the press. 
MODERN SEISMOLOGY. By G. W. Watxer, A.R.C.Sc., 
M.A., F.R.S., formerly Fellow of Trinity College, Cambridge. 
With Plates and Diagrams. 5s. net. 
PHOTO-ELECTRICITY, THE LIBERATION OF ELECT- 
RONS BY LIGHT; with Chapters on Fluorescence and 
Phosphorescence, and Photo-Chemical Actions and Photo- 
graphy. By H. STantey ALLEN, M.A., D.Sc., Senior 
Lecturer in Physics at University of London, King’s College. 
7s. 6d. net. 
THE SPECTROSCOPY OF THE EXTREME ULTRA- 
VIOLET. By Professor THEopoRE Lyman, Jefferson Phy- 
sical Laboratory, Harvard University, Cambridge, Mass. 
[In preparation. 
COLLOIDAL SOLUTIONS. By Professor E. F. Burton, 
The Physics Department, The University, Toronto. 
[In preparation. 
ATMOSPHERIC IONIZATION. By Professor J.C. McLENNaN, 
i Department of Physics, The University, Toronto. 
[In preparation. 
THE EMISSION OF ELECTRICITY FROM HOT BODIES. 
By O. W. RicHarpson, F.R.S., Wheatstone, Professor of 
Physics, King’s College, London. [In preparation. 
ELECTRIC WAVES. By Professor G. W. Pierce, Harvard 
University, Cambridge, Mass. [In preparation. 
LONGMANS, GREEN AN Di Ce: 
39 PATERNOSTER ROW, LONDON 
NEW YORK, BOMBAY AND CALCUTTA 
