CONTENTS 
Page 
PaTHOI^OGY. — BaCTERICIDAI, PROPKRTmS OP THE PRODUCTS OF RaDIUM EMANA- 
TION . . . . . . . .By John Albert Marshall 317 
Pbtroi^ogy. — ^The Jades op Middi^e America . By Henry S. Washington 319 
Physics. — On a Comparison op the Rei^ative Sensitiveness op Tei<Ephones 
By Carl Barus 326 
Physics. — The Equilibrium Positions op the Vacuum Gravitation Needi^e 
in 1921 and 1922 By Carl Barus 327 
Physics. — Further Measurements op Stei.i<ar Temperatures and Pi^anetary 
Radiation By W. W. Coblentz 330 
Physics. — Proop op a Theorem Due to Heaviside . By H. A. Lorentz 333 
Statistics. — The Stabii,ity op the Normai. Age Distribution 
By Alfred J. Lotka 339 
