TABLE OF CONTENTS V 



Tne Analysis of Simple Periodic Curves by a Projection Method, 

 with Special Reference to Estuary Tidal Problems. 

 By A. Norman Shaw and Violet Henry 139 



The Mutual Potential Energies of Circular Coils and Small 



Magnets. By E. R. I. Pratt 159 



The Effects of Ageing in Standard Weston Cells of a Modified 



Type. By A. Norman Shaw and H. E. Reilly. . . . 171 



The^ Variation of the Co-efficient of Viscosity of Gases with 



Temperature. By Robert Clark 177 



Experiments on Acoustic Depth Sounding carried out in the Gulf 



of St. Lawrence, September, 1915. By Louis V. King 181 



On the Theory and Design of Electrically Operated Aerial and 

 Submarine Sound Generators and Receivers. By Louis 

 V. King 183 



On the Design of Continuotisly Tunable Diaphragms. By Louis 



V. King 185 



The Adsorption of Gases by Carbonized Lignites. By Stuart 



McLean ' 187 



The Density of Adsorbing Materials. By Stuart McLean .... 197 



Use of Analogy in Vecto? Analysis. By Alfred Baker 201 



On a Derivation of an Equation oj a Rided Surface. By Charles 



T. Sullivan 207 



The Combustibility of Mixtures of Hydrogen and Helium. By 



John Satterly and E. F. Burton 211 



Possible Economies in the Electric Smelting of Iron Ore. By 



Alfred Stansfield 217 



The Analysis of Maple Products, Paper IL By J. F. Snell. . . . 221 



The ^'Alkali" Contents of Soils as Related to Crop Growth. By 



Frank T. Shutt and E. A. Smith 233 



A Study of the Estimation of Iron and the Separation of Man- 

 ganese from Iron by Notrose-phenythydroxylamine 

 Ammonium (Cupferron). By E. H. Archibald and 

 Ruth V. Fulton 243 



The Synthesis of b-palmitodistearin and b-stearodipalmitin. 



By George Stafford Whitby 255 



