Iii Large Crown 8vo. 



Cloth. 



ELECTRICAL THEORY AND THE 

 PROBLEM OF THE UNIVERSE. 



By G. W. DE TUNZELMANN, B.Sc., London, 



\i. mt> rof th. [nstitute oi Electrical Engineers; formerly Professor of Natural 

 Philosophy and Astronomy, E.M.8. "Britannia," Dartmouth. 

 Fundamental Electrical Phenomena— Units and Measurement— Meaning 

 ami Possibility ofa Mechanical Theory of Blectricity-The Ether- The Ether as a Frame- 

 work of Reference tor Motion— The Relations between Ether and Moving Matter— 

 nduction 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 Badio-Activity— Transmutations of Radio-Active Substances— Ages of tne 

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

 ud Nebula?— Arrangement and Number of Atoms in a Molecule— Changes in the 

 Aspecl ol Fundamental Mechanical Principles- Gravitation and Cohesion— The Place of 

 Mind in the Universe— Mathematical and other Appendices- Index. 



■ ie of the most valuable contributions to electrical literature the year has pro- 

 duced.**— -Times. 



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

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

 ui 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 he held as to the philosophies deduced by the author, 

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

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

 (New '\ ork). 



•• Advent ed 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. 



hi Five Vol times. 



Large 8vo. 



Sold Separately. 



A TEXT-BOOK OF PHYSICS. 



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



Professor of Physics, Birmingham University, 



Aij.1 Sir J. J. THOMSON, O.M., M.A., F.R.S., 



Professor of Experimental Physics in the University of Cambridge. 



VOL.1. In in Edition. PROPERTIES OF MATTER. 

 Vol. m. sixth Edition. SOUND, 

 Vol. hi Fourth Edition. HEAT. 



VOL. IV. In Three Parts. Two Bound Volumes. Parts Land II. now ready. 



Part III. at Press. ELECTRICITY AND MAGNETISM. 

 Vol. V. LIGHT, In Preparai 



Second Edition, Enlarged. In Crown 8vo. Cloth. Illustrated. 



METHODS OF AIR ANALYSIS. 



By .1. S. HALDANE, M.O., LL.D., F.E.S., 



ider 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, Fine Gases, Exhaust Gases from 



Engines, etc. 



-Collection of Samples— Apparatus for Air and Gas Analysis— Calculation 

 and Statement of Results— Portahle Apparatus— Approximate Estimation hy Flame 

 Test— Determination of Moisture— Blood, and Animal Tests— Dust in Air— Index. 



London : CHAS. GRIFFIN & CO., Ltd., Exeter St., Strand, W.C.2 

 Philadelphia: J. P. LIPPINCOTT COMPANY. 



