VI CONTENTS. 



Number 190. 



Page 



Art. XXVII. — Recent Stream Trenching in the Semi-arid 

 Portion of Southwestern New Mexico, a Result of Re- 

 moval of Vegetation Cover ; by J. L. Kich 237 



XXVIII. — Qualitative Detection of Certain Elements which 

 form Insoluble Sulphates : Barium, Strontium, (Cal- 

 cium,) and Lead ; by P. E. Browning and P. L. Blu- 



MENTIIAL _ 246 



XXIX. — Modified Procedure for the Detection of Silicates, 



Fluorides, and Fluosilicates ; by P. E. Browning , 249 



XXX. — Hinsdalite, a new mineral ; by E. S. Larsen, Jr. 



and W. T. Schaller 251 



XXXI. — Hunton Formation of Oklahoma ; by C. A. Reeds 256 



XXXII. — Study of the Time Interval in a Protective or 



Circuit Breaking Device ; by C. X. Wenrich 269 



XXXIII. — Some Herderite Crystals from Auburn, Maine ; 



by W. E. Ford : 283 



XXXIV. — Mineral Notes from the Mineral ogical Labora- 

 - tory of the Sheffield Scientific School ; by VV. E. Ford, 



etc 287 



XXXV.— Twenty-Foot Terrace and Sea-Cliff of the Lower 



Saint Lawrence ; by J. W. Goldthwait 291 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Chemically Active Form of Nitrogen Produced by 

 the Electric Discharge, R. J. Strutt : Gravimetric Determination of Flu- 

 orine, G. Stakck, 318. —Uranium Hexanuoride, Ruff and Heinzelmann: 

 Nitrification by Ultra-violet Rays. Berthelot and Gaudechon : Electric 

 Furnace for Chemical Purposes, Fischer and Tiede, 319. — Aqua Regia, 

 Priwoznik, 320. 



Geology and Mineralogy — Publications of the United States Geological Sur- 

 vey, 320. — Cambrian Faunas of China, C. D. Walcott : Middle Cambrian 

 Holothurians and Medusae, C. D. Walcott : Crinoid Fauna of the Knob- 

 stone Formation, F. Springer, 322. — Waverlyan Period of Tennessee, R. 

 S. Bassler : Vulcanische Erscheinungen der Erde, K. Schneider : 

 Some Mineral Constituents of a Dusty Atmosphere, W. N. Hartley, 

 323. — Crystallography and Practical Crystal Measurement, A. E. H. 

 Tutton, 325. 



Miscellaneous Scientific Intelligence — Mendelism, R. C. Punnett, 325.— 

 Plant-Animals : A study in Symbiosis, F. Keeble : Allgemeine Verer- 

 bungslehre, V. Haecker, 326. — Publications of the Carnegie Institution 

 of Washington : Publications of the Harvard College Observatory : United 

 States Naval Observatory, 327. — Publications of the Allegheny Observa- 

 tory of the University of Pittsburgh : British Association for the Advance- 

 ment of Science : Annual Report of the Board of Scientific Advice for 

 India for the Year 1909, 1910 : Seismological Society of America, 328. 



