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CONTENTS 
Page 
Mathematics. — New Properties of Aia. Reai. Functions By Henry Blumberg 283 
Mathematics. — Generauzed Limits in Generai. Analysis 
By Charles N. Moore 288 
Zoology. — A Preliminary Note on Tetramitus, a Stage in the Life Cycle 
OF A Coprozoic Amoeba By Martha Bunting 294 
StativSTics. — A Further Note on the Age Index of a Population .... 
By Raymond Pearl and T. J. LeBlanc 300 
Chemistry. — The Thermal Ionization of Gaseous Elements at High Tem- 
peratures By Arthur A. Noyes and H. A. Wilson 303 
Physics. — An Electron Theory of Electric Conduction in Metals 
By Edwin H. Hall 307 
Physics. — Static Deflection, Logarithmic Decrement and First Semi- 
Period of the Vacuum Gravitation Needle . . . By Carl Barus 313 
