CONTENTS 



Original Papers 



Page 

 Physics. — A direct-reading device for use in computing characteristics of 



vacumn tungsten lamps. J. F. Skogi-and 453 



Ph3'sics. — The effective resistance and inductance of iron and bimetallic 



wires. John M, Miller 455 



Physics. — The calculation of the maximum force between two parallel, 



coaxial, circular currents. Frederick W. Grover 456 



Physics. — On the construction of primary mercurial resistance standards. 



F. A. Wolff, M. P. Shoemaker and C. A. Briqgs 458 



Physical Chemistry. — An investigation of fusible tin boiler plugs. G. K. 



Burgess and P. D. Merica 461 



Geology. — Nepheline basalt in the Fort Hall Indian Reservation, Idaho. 



George R. Mansfield and Esper S. Laksen 463 



Botany. — Some new caesalpiniaceous trees of Panama. Henry Pittier . . 468 



References 



Physics 475 



Entomology 479 



Proceedings 



The Chemical Society 481 



The Geological Society 484 



The Anthropological Society 493 



