IV CONTENTS. 



Page 



X. The Transition Temperature of ]\fanganous Chloride : A New 



Fixed Point in Thermometry. By T. W. Richards and 



F. Wrede 341 



XL Difference in Wave-Lengths of Titanium XX 3900 and 3913 in 



Arc and Spark. By N. A. Kent and A. H. Avery . . 351 



XII. A Revision of the Atomic Weight of Lead. Preliminary Paper. 



— The Analysis of Lead Chloride. By G. P. Baxter 

 AND J. H. Wilson 363 



XIII. A Simple Method of Measuring the Intensity of Sourid. By 



G. W. Pierce 375 



XIV. Longitudinal Magnetic Field arid the Cathode Rays. By John 



Trowbridge 397 



XV. Note on Some Meteorological Uses of the Polariscope. By 



LoDis Bell 405 



XVI. The Sensory Reactions of Amphioxus. By G. H. Parker . . 413 



XVII. On Delays before avayvwpitrfu in Greek Tragedy. By W. P. 



Dickey 457 



XVIII. A New Method for the Determination of the Specific Heats of 



Liquids. By T. VV. Richards and A. W. Rowe . . . 473 



XIX. Pisistratus and his Edition of Homer. By S. H. New- 

 hall 489 



XX. Positive Rays. By John Trowbridge 511 



XXI. Concerning the Use of Electrical Heating in Fractional Distilla- 

 tion. By T. W. Richards and J. H. Mathews . . . 519 



XXII. Records of Meetings 527 



Report of the Council 547 



Biographical Notice 



Samuel Cabot 547 



