CONTENTS TO VOLUME VI. 



Number 31. 



Page 



Art. I. — Origin and Significance of Spines : a Study in Evo- 

 lution ; by C. E. Beecher. (With Plate I.) .1 



II. — Electrical Discharge from the point of view of the 



Kinetic Theory of Matter ; by J. E. Moore 21 



III. — Crystalline Symmetry of Torbernite; by T. L. 



Walker _ 41 



IV. — Further Separations of Aluminum by Hydrochloric 



Acid; by F. S. Havens 45 



Y. — Origin of the Corundum associated with the Peridotites 



in North Carolina ; by J. H. Pratt 49 



VI. — Erionite, a new Zeolite ; by A. S. Eakle 66 



VII. — Winter Condition of the Reserve Food Substances in 

 the Stems of certain Deciduous Trees ; by E. M. Wil- 

 cox 69 



VIII. — Metamorphism of Rocks and Rock Flowage; by C. 



R. VanHise _ _- 75 



IX. — New Species of Ceratopsia ; by O. C. Marsh 92 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Vapor Pressure of reciprocally soluble Liquids, Ostwald : 

 Electric Energy by Atmospheric Action, Warren : Significance of Ionic Reac- 

 tions in Electrochemistry, Kuster, 93. — Photoelectric Properties of Certain 

 Colored Salts, Elster and Geitel, 94. — Combustion in Rarefied Air, Benedi- 

 centi: Molecular Masses of Solid Substances, Traube, 95. — Liquefaction of 

 Hydrogen, Dewar, 96. — New Methods for the Measurement of Self -Inductance, 

 Mutual Inductance and Capacity, H. A. Rowland and T. D. Penndian, 97.— 

 Notes on the Zeeman Effect, J. S. Ames, R. P. Earhart and H. M. Reese, 99. 

 —Elementary Course of Physics, J. C. P. Aldous, 100. — Storage Battery, A. 

 Treadwell, Jr., 101. 



Geology and Natural History — Important Vertebrate Fossils for the National Mu- 

 seum, 0. C. Marsh, 101. — U. S. Geological Survey: Occurrence of Petroleum 

 in Burma, F. Noetling, 102. — Text-book of Entomology, A. S. Packard: 

 Bibliotheca Zoologica II., O. Taschenberg, 103. 



Miscellaneous Scientific Intelligence — Seestudien, E. Richter, 103. — Field Colum- 

 bian Museum, 104. 



