Vlll CONTENTS. 



Number 168. 



Page 



Art. XLVII.— Ordovician and Silurian Formations in Alex- 

 ander County, Illinois ; by T. E. Savage 509 



XLVIII. — Section at Cape Thompson, Alaska ; by E. M. 



Kindle — _..__. 520 



XLIX. — New Method of Measuring Light Efficiency; by 



C. C. Hutchins 529 



L. — Three New Fossil Insects from Florissant, Colorado; by 



S. A. Rohwer 533 



LI. — Connellite and Chalcophyllite from Bisbee, Arizona; by 



C. Palache and II. E. Merwin 537 



LII. — Optical Properties of Hastingsite from Dungannon, 



Hastings County, Ontario; by R. P. D. Graham 540 



LII I. — Electrolytic Determination of Chlorine in Hydro- 

 chloric Acid with the Use of the Silver Anode ; by F. A. 

 Gooch and H. L. Read 544 



SCIKNTIFIC INTELLIGENCE. 



Chemistry and Physics— Boiling Points of Metals, H. C. Greenwood: 

 Sodium Alum, W. R. Smith, 553. — The Elements of Metallography, Dr. 

 R. Rurer : Outlines of Chemistry with Practical Work, H. J. H. Fenton: 

 An Elementary Treatise on Qualitative Chemical Analysis, J. F. Sellers ; 

 A Manual of Qualitative Chemical Analysis, J. F. McGrEGory : The 

 Periodic Law, A. E. Garrett, 554. — A Text-Book of Physical Chemistry, 

 Theory and Practice, A. W. Ewell : A Text-Book of Physiological Chem- 

 istry, J. H. Long : Positive Rays. W. Wien : Apparent Kusion of Carbon 

 in the Singing Arc and in Sparks, M. La Rosa. — Determination of e/m, 

 K. Wolz : Spectroscopic Astronomique, P. Salet : Text-Book of Physics, 

 A. W. Duff, 556. — General Physics : Mechanics and Heat. J. A. Culler, 

 557. 



Geology— Publications of the United States Geological Survey, G. 0. Smith, 

 557. — Indiana, Department of Geology and Natural Resources ; Thirty- 

 Third Annual Report, W. S. Blatchley : Colorado Geological Survey, 

 R. D. George : Geological Survey of Michigan. A. C. Lane, 559. — Illinois 

 Geological State Survey, H. F. Bains : History, Geology and Statistics of 

 the Oklahoma Oil and Gas Fields, E. R. Perry and L. L. Hutchison : 

 Les Variations Periodiques des Glaciers, XIII Rapport, 1907, Ed. Bruck- 

 ner et E. Muret, 560.— Hand Book for Field Geologists, C. W. Hayes : 

 Crinoids of Tennessee, E. Wood : Dendroid Graptolites of the Niagaran 

 dolomites at Hamilton, Ont., R. S. Bassler, 561. — Carboniferous fauna 

 from Nowaja Semlja, G. W. Lee : Vorlaufige Mitteilung iiber das genus 

 Pseudolingula, A. Mickwitz, 562.— Clay-Working Industry in the United 

 States, H. Ries andH. Leighton: Elements of Mineralogy, Crystallography 

 and Blowpipe Analysis, A. J. Moses and C. L. Parsons, 563. 



Miscellaneous Scientific Inielliumce — National Academy of Sciences, 563. — 

 Carnegie Institution of Washington, 564. — Harvard College Observatory, 

 E. C. Pickering : Allegheny Observatory of the University of Pittsburgh: 

 Museum of the Brooklyn Institute of Arts and Sciences : The Story of the 

 Comets, G. F. Chambers : Mars et ses Canaux ; Les Conditions de vie, 

 Lowell-Moyen. 565. — Manual for Engineers, C. E. Ferris : Wood 

 Turning, G. A. Ross; Sir Joseph Banks, "The Father of Australia," J. H. 

 Maiden : American Association for the Advancement of Science, 566. 



Index. 567. 



