CONTENTS. 



Number 273. 



Page 

 Art XVII.— A Modification of the Periodic Table; by I. 



W. D. Hackh 481 



XVIII. — On the Cretaceous Age of the " Miocene Flora" of 



Sakhalin; by A. N. Kryshtofovich .._ _ 502 



XIX. — Paleozoic Glaciation in Southeastern Alaska; by E. 



Kirk 511 



XX. — The Lopolith; an Igneous Form Exemplified by the 



Duluth Gabbro; by F. F. Geout ._., 516 



XXI. — Geologic Section of Blair and Huntingdon Counties, 



Central Pennsylvania; by C. Butts 523 



XXII. — A Method for the Separation and Determination of 

 Barium Associated with Strontium; by F. A. Gooch 

 and M. A. Soderman _•_. 538 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Modern Inorganic Chemistry, J. W. Mellor : 

 James Woodhouse, a pioneer in Chemistry, 1770-1809, E. F. Smith, 541.— 

 Laboratory Manual, A. A Blanchard and F. B. Wade : Lessons in 

 Astronomy, Revised Edition. C. A. Young: The Origin of our Planetary 

 System, E. Miller. 542. — Ozone, and the Ultra-violet Transparency of 

 the Lower Atmosphere, Ft. J. Strutt, 543. — Molecular Frequency and 

 Molecular Number, H. S. Allen, 544. 



Geology — Thirteenth Report of the Director of the State Museum and Science 

 Department, State of New York, J. M. Clarke, 545. — Geology of the 

 Oregon Cascades, W. Du Pre Smith : Evolution of Vertebra?, and The 

 Osteology of some American Permian Vertebrates, III, S. W. Williston, 

 546 — Onaping Map-area, W. H, Collins : Timiskaming County, Quebec, 

 M. E. Wilson: The Pliocene History of Northern and Central Mississippi, 

 E. W. Shaw, 547. 



Miscellaneous Scientific Intelligence — Chemistry of Food and Nutrition, H. C. 

 Sherman: Physical Chemistry of the Proteins, T. B. Robertson, 548. — 

 Lecithin and Allied Substances, The Lipins, H. Maclean: Directions for 

 a Practical Course in Chemical Physiology, W. Cramer: An Outline of the 

 History of Phytopathology, H. H. Whetzel, 549. 



Obituary — H. S. Williams: J. D. Irving: C. C. Trowbridge, 550. 



