XVlll 



INDEX. 



Stebbins and Kunz, photo-electric 

 photometry of the 1918 eclipse, 269 



St'efansson, some oceanographical re- 

 sults of the Canadian Arctic expe- 

 dition, vi 



Stratton, metric system of weights 

 and measures, xiii 



Tatar material in Old Russian, 74 

 Trogloglanis Pattersoni, a new blind 

 fish from San Antonio, Texas, 397 

 Trowbridge, sound and flash rang- 

 ing, X 



V 



Velander and Kennelly, alternating- 

 current planevector potentiometer 

 measurements at telephonic fre- 

 quencies, 97 



W 



Walker, production of chemical war- 

 fare munitions, xi 



Warner, Siberia and the Czechs, iv 



Webster and Allen, on a new ( ?) 

 method in exterior ballistics, 382 



Webster, recent applications of phys- 

 ics in warfare, ix 



some considerations on the bal- 

 listics of a gun of seventy-five-mile 

 range, 373 



works of Ballistic Institute of 



Clark Univ., x 



Wheeler, parasitic aculeata, a study 



of evolution, i 

 Williams, deep Kansan pondings in 



Pennsylvania and the deposits 



therein, xiv 

 Wright, polarized light in the study 



of ores and metals, 401 



