CONTENTS. 



Page 

 I. Friction in Gases at Low Pressure. By J. L. Hogg 1 



II. The Quantitative Determination of Antimony by the Gutzeit Method. 



By C. R. Sanger and E. R. Riegel 19 



III. The Equivalent Circuits of Composite Lines in the Steady State. By 



A. E. Kennelly 29 



IV. Ilept (f>wews. A Study of the Conception of Nature among the 



Pre-Socratics. By W. A. Heidel 77 



V. A Revision of the Atomic Weight of Phosphorus. First Paper. — 

 The Analysis of Silver Phosphate. By G. P. Baxter and 

 G. Jones 135 



VI. The Reactions of Amphibians to Light. By A. S. Pearse .... 156 



VII. Average Chemical Compositions of Igneous-Rock Types. ByR. A. 



Daly 209 



VIII. On the Applicability of the Law of Corresponding States to the Joule- 

 Thomson Effect in Water and Carbon Dioxide. By H. N. Davis 241 



IX. Notes on Certain Thermal Properties of Steam. By H. N. Davis . 265 



X. The Spectrum of a Carbon Compound in the Region of Extremely 



Short Wave-Lengths. By T. Lyman 313 



XI. Experiments on the Electrical Oscillations of a Hertz Rectilinear 



Oscillator. By G. W. Pierce 323 



XII. The Conception of the Derivative of a Scalar Point Function with 



Respect to Another Similar Function. By B. O. Peirce . . . 337 



