CONTENTS. 



Page 

 Art. I. — The Relative Activity of Radium and the Uranium 

 with which it is in Radioactive Equilibrium; by J. H. L. 

 Johnstone and B. B Boltwood 1 



Art. IT. — The Devonian of Central Missouri (III). The 



Cooper Limestone; by D. K. Greger 20 



Art. III. — The Athabaska Series; by F. J. Alcock ..._....-. 25 



Art. IV. — Italite, a new Leucite Rock; by H. S. Washing- 

 ton 33 



Art. V. — The Late Lower Cretaceous at Federal Hill, Mary- 

 land; by E. W. Berry . . 48 



Art. VI. — Triassic and Jurassic Formations in southeastern 



Idaho and neighboring regions; by Gr. R. Mansfield . . 53 



Art. VII. — The Anderson Esker; by J. R. Reeves 65 



Art. VIII. — A New Agelacrinitid from the Chazy of New 



York ; by T. II. Clark 69 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Oxidation of Paraffin e by Means of Oxygen Gas, C. 

 Kelber : New Determination of the Absolute of the Radium-Uranium 

 Ratio, S. C. Lind and L. D. Roberts, 72. — Treatise on General and Indus- 

 trial Inorganic Chemistry, E. Molinari : Laboratory Manual of Elemen- 

 tary Colloid Chemistry, E. Hatschek, 73. 



Geology and Natural History — The Brachiopoda of the Namyau Beds, Northern 

 Shan States, Burma, S. S. Buckman, 74. — Systematische Petrographie auf 

 genetischer Grundlage, W. Hommel, 75. — Geological Survey of Western 

 Australia, A. Gibb Maitland : New Zealand Geological Survey, P. G. 

 Morgan: Principles of Animal Biology, A. Franklin Shull, etc., 76. — 

 Cytology, with Special Reference to the Metazoan Nucleus, W. E. A. 

 Agar, 77. — General Botany for Universities and Colleges, H. D. Dens- 

 more : Problems in Botany, W. L. Eikenberry : Joseph Dal ton Hooker 

 (Pioneers of Progress, Men "of Science), F. O. Bower, 78. 



Miscellaneous Scientific Intelligence— The National Research Council: Inter- 

 national Congress of Mathematicians, 79. — Pasteur, the History of a Mind, 

 Emile Duclaux : The Relation Between Religion and Science. A. S. 

 Woodburne : Explorations and Field Work of the Smithsonian Institu- 

 tion in 1919. 80. — Annual Report of the Board of Scientific Advice for 

 India for 1918-19 : The Technical Review : Report of the Commission 

 appointed by the University of Pennsylvania to investigate modern 

 Spiritualism, 81. 



Obituary— T. W. Backhouse : A. P. DeCandolle, 82. 



