_The Corpuscular Theory of Matter._ =Sir J. J. Thomson, M.A., F.R.S., D.Sc., LL.D., Ph.D.=, Professor of Experimental Physics, Cambridge, and Professor of Natural Philosophy at the Royal Institution, London. Demy 8vo. 7/6 net.

_Radio-Activity and Geology._ =John Joly, M.A., Sc.D., F.R.S.=, Professor of Geology and Mineralogy in the University of Dublin. Crown 8vo. 10/- net.

A catalogue of technical and scientific books published by Constable & Company Ltd — Part 41

_A Text-Book of Physics._ =H. E. Hurst, B.A., B.Sc.=, Hertford College, Oxford, late Demonstrator in Physics in the University Museum, Oxford, and =R. T. Lattey, M.A.=, Royal Naval College, Dartmouth, late Demonstrator in Physics in the University Museum, Oxford. Many Illustrations and Diagrams. Demy 8vo. 12/6 net.

A catalogue of technical and scientific books published by Constable & Company Ltd — Part 41

Also published in three volumes. Each sold separately.

A catalogue of technical and scientific books published by Constable & Company Ltd — Part 41

Part III. MAGNETISM AND ELECTRICITY. 5/- net.

_Electricity and Matter._ =Sir J. J. Thomson, M.A., F.R.S., D.Sc., LL.D., Ph.D.= Crown 8vo. 9/- net.

_Exercises in Physical Chemistry._ =Dr. W. A. Roth=, Professor of Chemistry in the University of Greifswald. Authorised Translation by =A. T. Cameron, M.A., B.Sc.=, of the University of Manitoba. Demy 8vo. 6/- net.

_Practical Physics._ =Franklin=, =Crawford= and =Macnutt=.

Vol. I. PRECISE MEASUREMENTS—MECHANICS AND HEAT. 9/- net.

Vol. II. ELEMENTARY AND ADVANCED MEASUREMENTS IN ELECTRICITY AND MAGNETISM. 9/- net.

Vol. III. PHOTOMETRY. EXPERIMENTS IN LIGHT AND SOUND. 7/- net.

_Atoms._ =Jean Perrin.= Translated by =D. Ll. Hammick=. Demy 8vo. 16 Illustrations. 9/- net.

CONTENTS.—Chemistry and the Atomic Theory. Molecular Agitation. The Brownian Movement—Emulsions. The Laws of the Brownian Movement. Fluctuations. Light and Quanta. The Atom of Electricity. The Genesis and Destruction of Atoms. Index.

_The Universe and the Atom._ The Ether Constitution, Creation and Structure of Atoms, Gravitation, and Electricity, Kinetically explained. =Marion Erwin, C.E.= Demy 8vo. 8/6 net.

CONTENTS.—Part I., First Principles. Part II., The Pan Cycle Hypothesis: Invisible Composition Light Waves, the Warp and Woof of the Ether Structure and of All Things Material.

_The Profession of Chemistry._ =Richard B. Pilcher=, Registrar and Secretary of the Institute of Chemistry of Great Britain and Ireland. Crown 8vo. 6/6 net.