VI CONTENTS. 



Number 184. 



Page 



Art. XXIV. — Ionization of Different Gases by the Alpha 

 Particles from Polonium and the Relative Amounts of 

 Energy Required to Produce an Ion ; by T. S. Taylor 249 



XXV. — Heat Generated by Radio-active Substances ; by 



W. DlJANE 257 



XXVI. — Contributions to the Geology of New Hampshire, 

 IV. Geology of Tripyramid Mountain ; by L. V. 

 Pirsson and Wm. N orth Rice 269 



XXVII. — Note on a Method in Teaching Optical Mineralogy; 



by F. W. McNair 292 



XXVIII. — New Paleozoic Insects from the Vicinity of 



Mazon Creek, Illinois ; by A. Handlirsch 297 



XXIX. — Results of a Preliminary Study of the so-called 



Kenai Flora of Alaska ; by A. Hollick 327 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Use of Calcium Carbide for the Determination of 

 Moisture, Masson : Action of Water upon Phosphorus Pentoxide, Bala- 

 reff, 331. — Fractional Crystallization of Argon, F. Fischer and V. 

 Froboese : Qualitative Chemical Analysis, Baskervili/e and Curtman : 

 Die Verwertung des Luf tstickstoffs, J. Zenneck, 332. — Allen's Commercial 

 Organic Analysis : Absorption Spectra of Solutions, H. C. Jones and W. 

 W. Strong, 333. 



Geology and Mineralogy — Thirty-fourth Annual Eeport Department of 

 Geology and Natural Eesources, Indiana, 333. — West Virginia Geological 

 Survey, Vol. 5, Forestry Wood Industries, A. B. Brooks : Geological Sur- 

 vey of Tennessee : Atlas Phographique des Formes du Eelief Terrestre, 

 334. — Illinois Oil Fields in 1910 : Physical Notes on Meteor Crater, Ari- 

 zona, 335. — Mineralogie de la France et de ses Colonies : Practical Min- 

 eralogy Simplified for Mining Students, Miners and Prospectors, J. P. 

 Eowe : Calcites of New York, H. P. Whttlock : Mineraux des Pegmatites 

 des Environs dAntsirabe a Madagascar, L. Duparc, 337. — Production of 

 Phosphate Eock in Florida during 1910: North Carolina Geological and 

 Economic Survey, 338. — Note on the parietal crest of Centrosaurus apertus 

 and a proposed new name for Stereocephalus tutus, L. M. Lambe, 339. 



Miscellaneous Scientific Intelligence— Carnegie Foundation for the Advance- 

 ment of Teaching, 339. — Text-Book of General Bacteriology, E. O.Jordan: 

 Catalogue of the Lepidoptera Phalaena3 in the British Museum, G. F. 

 Hampson, 340. 



Obituary — H. P. Bowditch : J. H. van't Hoff : J. W. Bruhl, 340. 



