CONTENTS. 



Niimber 261. 



Page 



Art. XYI. — Volcanologic Investigations at Kilauea, with 



Plate I (frontispiece) ; by T. A. Jaggae, Jr. 161 



XVII. — On the Qualitative Separation and Detection of 



Gallium ; by P. E. Browning and L. E. Porter ._ 221 



XVIII. — On the Calibration and the Constants of Emanation 



Electroscopes ; by O. C. Lester. _ _. 225 



XIX. — Measurements of the Radioactivity of Meteorites ; 



by T. T. QuiRKE and Leo Finkelstein 237 



XX. — Occurrence of Euxenite in South Sherbrooke Town- 

 ship, Ontario ; by W. G. Miller and C. W. Knight _.. 243 



XXI. — A Remarkable Crystal of Apatite from Mt. Apatite, 



Auburn, Maine ; by W. E. Ford 245 



William Bullock Clark _ 247 



