viii CONTENTS. 



Number 66. 



Page 

 Art. XXXIII.— The New Spectrum; by S. P. Langley. 



With Plate VII 403 



XXXIV.— Rival Theories of Cosmogony ; by O. Fisher... 414 



XXXV.— Study of some American Fossil Cycads. Part IV. 

 Microsporangiate Fructification of Cycadeoidea ; by G. 

 R Wieland - - 42 3 



XXXVL— Studies of Eocene Mammalia in the Marsh Col- 

 lection, Peabody Museum ; by J. L. Wortman. With 

 Plate VI -- 437 



XXXVII. — CaBsium-Antimonious Fluorides and Some Other 

 Double Halides of Antimony; by H. L. Wells and F. 

 J. Metzger 451 



XXXVIII.— "Mohawkite"; by J. W. Richards ._ _ 457 



Henry Augustus Rowland 459 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Radio-active Lead, Hofmann and Strauss: Zirconia of 

 Euxenite from Brevig, Hofmann and Prandtl, 463. — Action of Radium Rays 

 upon Selenium, E. Bloch: Reducing-power of Magnesium and Aluminum, A. 

 Duboin: Method of Determining Atomic Weights, Based upon the Transparency 

 of Substances to the X-Rays. L. Benoist, 464. — Presence of Platinum upon an 

 Egyptian Hieroglyphic Inscription, Berthelot : Generalization from Trouton's 

 Law, de Forcand, 465. — Wissenschaftliche Grundlagen der analytischen 

 Chemie, W. Ostwald: Spectrum of Carbon Compounds, A. Smithells, 466. — 

 Absorption of Gas in a Crookes Tube, R. S. Willow: Mechanical Movements 

 of Wires produced by Electrical Discharges which also make these Movements 

 luminous, O. Viol : Band Spectrum of Oxides of Aluminum and Nitrogen, G. 

 Berndt: Electricite et Optique ; La. Lumiere et les Theories Electrodynam- 

 iques, H. Poincare, 467. 



Geology and Natural History — U. S. Geological Survey, 21st Annual Report of 

 the Director. C. D. Walcott, 468.— Physiography of Acadia, R. Daly: Carte 

 Geologique du Massif du Mont Blanc, L. Duparc and L. Mrazec: Mineral 

 constituents of dust and soot from various sources, W. N. Hartley and H. 

 Ramage, 470.— Studies in Fossil Botany, D. H. Scott: Flora of Western Mid- 

 dle California, W. L. Jepson. 471.— Grand Rapids Flora, E. J. Cole, 472.— 

 Variations of a newly-arisen Species of Medusa, A. G. Mayer, 473. 



Miscellaneous Scientific Intelligence— Annals of the Astrophysical Observatory of 

 the Smithsonian Institution, S, P. Langley and C. G. Abbot, 473. — Report 

 of the U. S. National Museum: Journal of Hygiene: Annals of the Astronom- 

 ical Observatory of Harvard College, E. C. Pickering and E. S. King, 474. 



Index to Volume XI, 475. 



