INDEX SLIP. 
Zeleny, John. —The Telocity of the Ions produced in Gases by Kontgen 
Bays. 
Phil. Trans., A, rol. 195, 1900, pp. 193-234. 
Ionic Velocity in Gases—Method for Determination ; Errors in Determina¬ 
tion ; Effect of Moisture ; Difference between Positive and .Negative. 
Zeleny, John Phil. Trans., A, vol. 195, 1900, pp. 193-234. 
Ions— Comparison of Charges carried by. 
Zeleny, John Phil. Trans., A, vol. 195, 1900, pp. 193-234. 
