CONTENTS 



Original Papers " ; Page 



Physics. — A radioactive quantity requiring a name. N. Ernest Dorsey 381 



Mineralogy. — Lazulite of Graves Mountain, Georgia, with notes on other occurrences 

 in the United States Thomas L. Watson 386 



Abstracts 



Inorganic Chemistry 391 



Petrology 392 



Geology 392 



Volcanology 394 



Entomology 395 



Ethnology 395 



Proceedings 



Philosophical Society 395 



Scientific Notes and News 400 



ANNOUNCEMENTS OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES 



Wednesday, October 5. The Society of Engineers, at the Cosmos Club, 

 at 8:15 p.m. Program: 



John Mxxrphy : Ice formation and prevention, with special reference to frazil and anchor 

 ice. 

 Thursday, October 6. The Entomological Society, at the National Museum 

 at 8 p. m. Program: 

 J. N. AldriCh: Insect collecting in Alaska. Notes and exhibition of specimens. 



Saturday, October 8. The Philosophical Society, at "the Cosmos Club, 

 at 8:15 p.m. Program: 

 H. ,S. Roberts, 3d : A furnace temperature regulator, 

 H. N. Eaton: Aerial navigation. 



Tuesday, October 11. The Institute of Electrical Engineers, at the Cosmos 

 Club, at 8: 15 p. m. Program: 

 I,. E. Whittemore: Principles of the radio direction finder, and its application to 

 marine navigation. 



Thursday, October 13. The Chemical Society, at the Cosmos Club, at 

 8 p.m. Program: 



E. E. Si^osson: The constructive chemist. 

 . Reports from the New York meeting of the American Chemical vSociety. 



Saturday, October 15. The Biological Society. 



OTHER ANNOUNCEMENTS 

 The Physics Club of the Bureau of Standards: 



Monday, October 17, at 4: 30 p. m. Program: 

 Arthur L. Day: The study of California earth movements. 



Monday, October 24, at 4: 30 p. m. Program: 

 H. G. Gale: Earth tides. 



