I 
CONTENTS 
Page 
Chemistry. — The Rei/ATion of Chalcedony to the Other Forms op Sh^ica 
By E. W. Washburn and L. Navias 1 
Physics. — The Frequency-sensitivity op Normai. Bars . . . , 
By H. Fletcher and R. L. Wegel 5 
GeoIvOgy. — Corai, Reeps of the I/OUisiade Archipei*ago .... 
By W. M. Davis 7 
Physics. — Experiments with the Vacuum Gravitation Needi^e . 
By C. Barus 13 
Bache Fund: National Academy op Sciences . . . . .16 
