Vlll CONTENTS. 





Number 120. 



Page 



Art. XLI. — Two New Ceratopsia from the Laramie of 

 Converse County, Wyoming; by J. B. Hatcher. (With 

 Plates XII, XIII.) . 413 



XLII. — .Restoration of the Horned Dinosaur Diceratops ; 



by Richard S. Lull. (With Plate XIY.) 420 



XLIII. — Triassic System in New Mexico ; by Charles R. 



Keyes _ 423 



XLIV. —Structure of the Upper Cretaceous Turtles of New 



Jersey: Agomphus ; by G. R. Wieland 430 



XLY. — The Cambro-Ordovician Limestones of the Middle 



Portion of the Valley of Virginia; by H. D. Campbell 445 



XLVI. — Relations of Ions and Nuclei in Dust-free Air ; by 



Carl Barus _ . _ _ _ 448 



XLVII. — Additional Notes upon the Estimation of Cad- 

 mium by Means of the Rotating Cathode, and Summary; 

 by Charles P. Flora _ _ _ _ . . 454 



XLVIII. — The Estimation of Cadmium as the Oxide ; by 



Charles P. Flora ._ ._ 456 



XLIX. — The Mounted Skeleton of Triceratops prorsus in 

 the U. S. National Museum; by C. Schuchert. (With 

 Plate XV.) 458 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — A New Formation of Diamond, Sir W. Crookes: 

 A New Compound of Iron, Otto Hauser : Nitrosyl Fluoride, Ruff and 

 Stauber, 460. — The Atomic Weight of Strontium, T. W. Richards : 

 Qualitative Analysis, E. H. S. Bailey and H. P. Cady : Charging Effect 

 of Rontgen Rays, Karl Hahn, 461. — Emission of Negative Corpuscles by 

 the Alkali Metals, J. J. Thomson : A New Method of showing the Presence 

 of Neon, Krypton, and Xenon, S. Valentiner and R. Schmidt : The 

 Mechanical Properties of Catgut Musical Strings, J. R. Benton, 462. 



Geology and Mineralogy. — Iowa Geological Survey, Volume XV, 463. — Sum- 

 mary Report of the Geological Survey Department of Canada, R. Bell : 

 Glaciation of Southwestern New Zealand, E. C. Andrews, 464. — Mastodon- 

 Reste aus dem interandinen Hochland von Bolivia, J. F. PoMpeckj : 

 Description of New Rodents and Discussion of the Origin of Daemonelix, 

 O. A. Peterson, 465. — Economic Geology of the Bingham Mining District, 

 Utah, 466. — Economic Geology, 467. — Minerals in Rock Sections, L. Mel. 

 Luquer, 468. 



Miscellaneous Scientific Intelligence. — National Academy of Sciences, 468. — 

 The Geological Society of America : A Laboratory Guide in Bacteriology, 

 Paul G. Heinemann: British Tunicata, Alder and Hancock, 469. — Cata- 

 logus Mammalium tarn viventium quam fossilium, E. L. Trouessart : 

 Carnegie Institution of Washington : A Handbook of the Trees of Cali- 

 fornia, A. Eastwood, 470. 



Obituar y. —Professor Dewitt Bristol Brace, Professor Ralph Copeland, 

 Professor D. W. von Bezold, 470. 



Index to Vol. XX, 471. 



