viii CONTENTS. 



Number 102. 



Page 

 Charles Emerson Beechek (with a Portrait, Plate XXIII) 411 



Art. XXXIX. — Dinosaur Footprints from Arizona ; by E. 



S, Riggs.. . 423 



XL. — New Habit for Chalcopyrite ; by R. W. Richards 425 



XLI. — Molecular Weights of Liquids, with a few Words 



about Association ; by C. L. Speyers 427 



XLII. — Relation of Mass Action and Physical Affinity to 

 Toxicity, with incidental discussion as to how far elec- 

 trolytic dissociation maybe involved ; by J. B. Dandeno 437 



XLIII. — Tourmaline from San Diego County, California ; 



by D. B. Sterrett. (With Plate XXIV) .'. - . . . .. 450 



XLIV.— Limit of Error in the Volumetric Determination of 



Small Amounts of Gold ; by R. N. Maxsox _ 466 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Hydrates in Solution, H. C. Jones : Microscopical 

 Method of Determining Molecular Weights, G. Bargee,, 471. — Rubidium- 

 Mercuric Double Salts, Grossmann : Zirconium Tetra-iodide, Stahler 

 and Denk, 472. — Use of the Thermal Junction in the Ultra- Violet, A. 

 Pfluger : Internal Friction of Nitrogen, S. W. Holman. etc. : Damping 

 of Electrical Oscillations, Bjerknes, etc., 473. — Compressibility of Solids, 

 J. Y. Buchanan, 474. 



Geology and Natural History — United States Geological Survey, 477. — Atoll 

 of Funafuti; Borings into a Coral Reef and the Results, Sollas, 478. — 

 Revision of the Paleozoic Bryozoa, E. O. Ulrich and R. S. Bassler, 479. 

 — Attempt to Classify Paleozoic Batrachian Footprints, G. F. Matthew : 

 Geology, T. C. Chamberlin ond R. D. Salisbury, 480. — Mineral Resources 

 of the United States for the Calendar year 1902, D. T. Day : Fragmenta 

 Florae Philippinae, J. Perkins, 481. — Botanical Publications by the 

 Bureau of Government Laboratories at Manila, 482. 



Miscellaneous Scientific Intelligence — Wilhelm Ostwald, P. Walden, 483. — 

 Changes in the Transparency of the Earth's Atmosphere : Alpheus Hyatt 

 Memorial Fund for Field Lessons : Altitudes in the Dominion of Canada, 

 J. White : Publication of the Earthquake Investigation Committee in 

 Foreign Languages : Clarkson Bulletin, Vol. I, No. 2, April, 1904, 484. 



Index to Vol. XVII, 485. 



