CONTENTS. Vll 



Number 173. 



Page 

 Art. XXXII. — Contributions to the Geology of the Grand 

 Canyon, Arizona.-— The Geology of the Shinumo Area ; 

 by L. F. Noblk. Part I . 369 



XXXIII. — Additions to the Pleistocene Flora of Alabama ; 



by E. W. Berry 387 



XXXIV. — Application of Potassium Ferricyanide in Alka- 

 line Solution to the Estimation of Arsenic, Antimony, 

 and Tin ; by H. E. Palmer _ . . 399 



XXXV. — New Cystid from the Clinton Formation of Onta- 

 rio — Lepadocystis clintonensis ; by W. A. Parks 404 



XXXVI. — New Petrographic Microscope ; by F. E. Wright 407 



XXXVII. — New Ocular for Use with the Petrographic Micro- 

 scope ; by F. E. Wright 415 



XXXVIII. — Behavior of Crystals in Light Parallel to an 



Optic Axis; by C.Travis 427 



XXXIX. — Some Simple Improvements for a Petrographical , 

 Microscope ; by A. Johannsen_ 435 



XL. — Natural Naphtha from the Province of Santa Clara, 



Cuba ; by C. Richardson and K. G. Mackenzie . . 439 



XLI. — Intrusive Granites and Associated Metamorphic Sedi- 

 ments in Southwestern Rhode Island ; by G. F. Loughlin 447 



SCIENTIFIC INTELLIGENCE. 



Chemistry — Metallic Zirconium, Weiss and Neumann, 457. — Gas-volumetric 

 Determination of Hydrogen, Paal and Hartmann : Theoretical Principles 

 of the Methods of Analytical Chemistry, M. G. Chesneau : Analyse Volu- 

 metrique, L. Duparc et M. Basadonna, 458. — Solid Bitumens, S. F. 

 Peckham, 459. 



Geology — Iowa Geological Survey, S. Calvin : West Virginia Geological 

 Survey. I. C. White, 459. — New Zealand Geological Survey, J. M. Bell, 

 460. — Certain Jurassic (Lias-Oolite) Strata of South Dorset, and their Cor- 

 relation, etc., S. S. Buckman, 461. — Pal aeontologia Universalis : Geologic 

 Atlas of the United States : Folio 169, Watkins Glen-Catatonk, New 

 York, 1909, H. S. Williams, R. S. Tarr, and E. M. Kindle, 462. -Geol- 

 ogy of the Auburn-Genoa Quadrangles, D. D. Luther, 463. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 463. — 

 Ostwald's Klassiker der Exakten Wissenschaften, 404. 



Obituary — Alexander Agassiz : Robert Parr Whitfield : Charles Reid 

 Barnes : Samuel Ward Loper. 



