IN THE 



INTERNATIONAL SCIENTIFIC SERIES, 



NOW READY. 

 XC. THE NEW PHYSICS AND ITS EVOLUTION. By LUOIEN 



POINCARE. 



XCI. THE EVOLUTION OF FORCES. By Dr. GUSTAVE 

 LE BON. 



XCII. THE RADIO-ACTIVE SUBSTANCES: Their Properties 

 and Behaviours. By WALTER MAKOWER (Assistant. Lec- 

 turer in Physics at the Victoria University of Manchester;. 



XCIII. MUSIC : Its Laws and Evolution. By JULES COMBARIEU, 

 Lecturer at the College de France. 



XCIY. THE TRANSFORMATIONS OF THE ANIMAL WORLD. 



By M. CHARLES DEPERET, Corresponding Member of the 

 Institute de France and Dean of the Faculty of Sciences at 

 the University de Lyon. 



XCV. HUMAN SPEECH: Its Physical Basis. By N. C. MAC- 



NAMARA, F.R.C.S. 



XCVI. THE PERIODIC LAW. By A. E. GARRETT, B.Sc. (By 

 Research.) Illustrated by tables and diagrams. 



The contents of this new important volume in the series are : Intro- 

 ductory Chapter dealing with methods of finding atomic weights; 

 Historical Survey, including Prout's work, Dobereiner's Triads, Petten- 

 kofer, Gladstone, Cooke and Dumas, Newland's Octaves, The Telluric 

 Helix of de Chancourtois, The Periodic Law of Mendeleeff, Lothar 

 Meyer's Atomic Volume Curve. 



Carnelley's work on the melting and boiling points of the elements 

 and their halogen compounds, Sir Win. Crooke's Spiral, Johnstone 

 Stone} 1 's Logarithmic Spiral. 



The properties of the elements as periodic functions of their atomic 

 weights, illustrated with numerous diagrams 



The various attempts to obtain a formula for the calculation of the 

 atomic weights of the elements. 



The atom considered from the standpoint of the periodic law. 



The places of the Argon group, and of the Radio-active substances 

 in the periodic table. 



