IV CONTENTS. 



Page 



XIII. Theory of Coupled Circuits, under the Action of an Impressed 



Electromotive Force, toith Applications to Radiotelegraphy . By 



G. W. Pierce 291 



XIV. The Action of Mercury on Steel at High Pressures. By P. W. 



Bridgmax 323 



XV. Infini'.esimal Properties of Lines in S^ with Applications to Circles 



in S3. By C. L. E. Moore 343 



XVI. The Indeterminate Product. By II. B. Phillips 363 



XVII. Vector-Diagrams of Oscillating-Currenl Circuits. By A. E. 



Kennelly 371 



XVIII. Division of Labor among Ants. By E. N. Buckingham . . 423 



XIX. yi Method for Determining Heat of Evaporation as Applied to 



Water. By T. W. Richards and J. H. Mathews . . . 509 



XX. The Effects of Sudden Changes in the Inductances of Electric 

 Circuits as Illustrative of the Absetice of Magnetic Lag and of 

 the von Waltenhofen Phenomenon in Finely Divided Cores. 

 Certain Mechanical Analogies of the Electrical Problems. By 

 B. O. Peirce 539 



XXI. The Internal Resistance of the Lead Accumulator. By II. W. 



Morse and L. W. Sargent 587 



XXII. Notes on the Electrical Conductivity of Argentic Sulphide. By 



II. V. Hayes 613 



XXIII. On the Electromagnetic and the Thennomagnetic Transverse and 



Longitudinal Effects in Soft Iron. By E. H. Hall and 



L. L. Campbell 623 



XXIV. On the Opacity of Certain Glasses for the Ultra-Violet. By 



Louis Bkll 609 



XXV. Records of Meetings 683 



Ru.MFORD Premium 748 



Index 749 



