In Large Crown 8vo. Cloth. 18s. net. 



ELECTRICAL THEORY AND THE 

 PROBLEM OF THE UNIVERSE. 



By G. W. DE TUNZELMANN, B.So., LONDON, 



Member of the Institute of Electrical Engineers ; formerly Professor of Natural 

 Philosophy and Astronomy, H.M.S. "Britannia," Dartmouth. 



CONTENTS. Fundamental Electrical Phenomena Units and Measurement Meaning 

 and Possibility of a Mechanical Theory of Electricity The Ether The Ether as a Frame- 

 work of Reference for Motion The Relations between Ether and Moving Matter 

 Electric Conduction in Gases The Faraday-Maxwell Theory The Electron Theory- 

 Magnetism and the Dissipation of Energy Contact Electrification and Electrolysis- 

 Metallic Conduction Optical Phenomena The Mechanism of Radiation General 

 Phenomena of Radio-Activity Transmutations of Radio-Active Substances Ages of the 

 Sun and Earth The Solar Corona, The Aurora, and Comets' Tails Radio-Activity in 

 Stars and Nebulaj Arrangement and Number of Atoms in a Molecule Changes in the 

 Aspect of Fundamental Mechanical Principles Gravitation and Cohesion The Place of 

 Mind in the Universe Mathematical and other Appendices- INDEX. 



"One of the most valuable contributions to electrical literature the year has pro- 

 duced. "Times. 



' ' This remarkable book is neither wholly a text-book on the physics of electricity nor 

 wholly a book on the philosophy of the universe, but a blend of the two. . . . The writer 

 is a trained physicist, astronomer, and mathematician by profession, as well as a specu- 

 lative philosopher by choice. . . . The physics of the subject are very interestingly set 

 forth. . . . Whatever opinion be held as to the philosophies deduced by the author, 

 we heartily commend him for attempting to discuss these important and recondite 

 subjects on strictly scientific lines of reasoning." The Electrical World and Engineer 

 (New York). 



" Advanced students of physics will find the book of the greatest use, since it brings 

 together a great mass of information which is not readily accessible elsewhere in a 

 connected form. We strongly recommend the work to such, and also to the general reader 

 who is interested in the advance of scientific knowledge." The Journal of Education. 



In Five Volumes. Large 8vo. Sold Separately. 



A TEXT-BOOK OF PHYSICS. 



By J. H. POYNTING, Sc.D., F.R.S., 



Professor of Physics, Birmingham University, 



And SIR J. J. THOMSON, O.M., M.A., F.R.S., 



Professor of Experimental Physics in the University of Cambridge. 

 VOL. I. FIFTH EDITION. 10s. 6s. net. PROPERTIES OF MATTER. 

 VOL. II. SIXTH EDITION. 8s. 6d, net. SOUND. 

 VOL. Ill FOURTH EDITION. 15s. net. HEAT. 

 VOL. IV. In Three Parts. Two Bound Volumes. Parts I. and II. 10s 6d, 



Part III. at Press. ELECTRICITY AND MAGNETISM. 

 VOL. V. LIGHT, In Preparation. 



SECOND EDITION, Enlarged. In Crown 8vo. Cloth. Illustrated. 

 6s. net. 



METHODS OF AIR ANALYSIS. 



By J. S. HALDANE, M.D., LL.D., F.R.S., 



Reader in Physiology and Fellow of New College, Oxford. 



An Account of Methods of Air Analysis suitable for work in Physiology, 

 Hygiene, Investigations of Mine Air, Flue Gases, Exhaust Gases from 

 Engines, etc. 



CONTENTS. Collection of Samples Apparatus for Air and Gas Analysis Calculation 

 and Statement of Results Portable Apparatus Approximate Estimation by Flame 

 lest Determination of Moisture Blood, and Animal Tests Dust in Air INDEX. 



LONDON : CHAS. GRIFFIN & CO., LTD., EXETER ST., STRAND, W.C.2 



