CONTENTS TO VOLUME XVIII. 



Nul . 103. 



Page 

 Art. I. — Atmospheric Radio-activity ; by H. A. Biimstead_ 1 



II. — Studies in the Cyperacese ; by T. Holm. XXII 12 



III. — Note on a New Permian Xiphosuran from Kansas ; by 



C. E. Beecher 23 



IV. — Kivnzite and its Unique Properties ; by C, Baskerville 



and G. F. Kunz _ 25 



V.— Analysis ot Kunzite ; by R. O. E. Davis 29 



VI. — Occurrence of Celestite near Syracuse, N. Y., etc. ; 



by E. H. Kraus 30 



VII. — Famous Fossil Cycad ; by L. F. Ward 40 



VIII. — Comparison of Two Ways of Using the Galvan- 

 ometer ; by H. A. Perkins 53 



IX. —Further Work with the Rotating Cathode ; by H. E. 



aIedway 56 



X. — Transverse Vibrations of Helical Springs ; by H. L. 



Broxsox _ 59 



XI. — New Type of Calcite from the Joplin Mining District ; 



by D. B. Sterrett 73 



XII. — Radium and the Electron Theory ; by J. Trowbridge 



and W. Rollins 77 



XIII. — Pseudomorphs and Crystal Cavities ; by J. P. Rowk 80 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — =Enianiuni, F. Giesel : Radio-activity and Matter, 

 Winkler : Detection of Chlorides in the Presence of Bromides, C. Jones, 

 81. — Solubility of Silicon in Zinc and Lead, Moissan and Siemens : Ana- 

 lytical Chemistry, Vol. II, Quantitative Analysis, F. P. Treadwell ; 

 Laboratory Exercises in Physical Chemistry, F. H. Getman, 82. — Chemie 

 der Eiweisskoerper, 0. Cohnheim : Vapor Pressure of Mercury at ordinary 

 Temperatures, E.W. Morley : Penetrating Pays of Radium, E. Paschen, 83. 

 — Use of the Thread Galvanometer, W. Einthoven : Hot Oxide Coherer, M. 

 Hornemann : X-Rays and N-Rays, R. Blondlot, 84. — Lehrbuch der ' 

 Physik, O. D. Chwolson : Applications of the Kinetic Theory, W. P. 

 Botnton, 86. — Entropy ; or Thermodynamics from an Engineer's Stand- 

 point, J. Swinburne, 87. — Electricity and Matter, J. J. Thomson : Etude 

 sur les Resonances dans les Reseaux de distribution par Courants alterna- 

 tifs, G. Chevrier : Elektrische Fernphotographie und Ahnlichcs, A. 

 Korn : Telescope, T. Nolan, 88. — Scientia, Phys. Mathematique. 



Geology and Natural History — Glacial Conglomerate, Transvaal, South 

 Africa, E. T. Mellor : Wisconsin Geological and Natural History Survey, 

 89. — Geological Survey of Ohio, E. Orton : Geological Survey of New 

 Jersev. H. B. Kummel : Delta Plains in the Nashua Vallev, W. O. Crosby, 

 90.— Floods of the Spring of 1903 in the Mississippi Watershed, H. C. 

 Frankenfield : Catalogue of the Ward-Coonley Collection of Meteorites, 

 H. A. Ward : Harvard Experiment Station in Cuba, G. L. Goodale, 91. 

 — Report of the Harvard Botanical Station in Cuba for the Month of May, 

 1904, R. M. Grey, 92. — Catalogus Mammalium, E.-L. Trouessart, 95. 



Miscellaneous Scientific Intelligence — Publication of the Earthquake Investi- 

 gation Committee in Foreign Languages, 95. — Ready Reference Tables, C. 

 Hering: University of Chicago ; Decennial Publications, Field Columbian 

 Museum : Publications of Bureau of Government Laboratories at Manila, 96. 



Obituary— Sir Clement Le Neve Foster: Prof. Alexander W. William- 

 son : Frank Rutley : Prof. Emile Dtjclaux : Prof. Charles Soret, 96. 



