CONTENTS OF VOL. VI 



PAGE 



The Progress of the Electric Light. Maurice Solomon, M.I.E.E. i 



Radioactivity. Illustrated. W. H. Bragg, F.R.S 15 



The Chemical History of the Terpenes. Sir William A. Tilden . 46 

 Some Aspects of Periodicity in Plants. Illustrated. Percy Groom . 62 

 The Part played by Sir Charles Bell in the Discovery of the 



Functions of Motor and Sensory Nerves (1822). A. D. Waller, 



M.D., F.R.S 78 



Life without Oxygen. The Anaerobic Beginnings of Life. Carl 



Snyder 107 



The Soil and the Plant : A Review of Some Recent American 



Hypotheses. Illustrated. Edward J. Russell, D.Sc. (Lond.) . .135 

 Mathematics in English Schools. Charles Godfrey, M.A. . . 161 

 Tradition in Education : A Plea for a Modified Curriculum and for 



the General Recognition of Manual Instruction in Schools. T. S. 



Usherwood 181 



The Basic Principles of Protective Colouration in the Animal 



Kingdom. Mrs. Arthur Bell 210 



Bases of Bio-chemical Interest derived from the Proteins. 



George Barger, D.Sc 221 



The History of an Agricultural Experiment Station. A. D. 



Hall, M.A., F.R.S 243 



The Humphrey Internal-Combustion Pump. Illustrated. Hugh de 



P. Birkett, B.Sc 258 



The Ethics of Food.— III. Bread (continued). Illustrated . . . 279 

 The Action of Gravity upon the Movements of Aquatic Micro- 

 organisms. Illustrated. Harold Wager, F.R.S 298 



The Corrosion of Iron and Other Metals. — II. H. E. A. . . 311 

 The Ether of Space and the Principle of Relativity. Sir Oliver 



Lodge, F.R.S 337 



The Structure of the Atmosphere and the Texture of Air 



Currents in Relation to the Problems of Aviation. Illus- 

 trated. W. N. Shaw, F.R.S., Sc.D. ....... 345 



The Interpretation of Life. F. Carrel 372 



V 



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