CONTENTS 
V Page 
Physics. — Radiation from a Moving Magneton By H. Bateman 367 
Astronomy. — On the Distribution of the Aphelia of the Secondary Bodies 
OF the Solar System 5y C. Z). Perrine 371 
Geology.— Discoidal Structure of the Lithosphere , , . By Bailey WiUis 377 
Astronomy.— Recent Simultaneous Measurements of the Solar Constant of 
Radiation at Mount Wilson, California, and Calama, Chile .... 
By C.G.Abbot 383 
Physics. — Rotating Projectiles from Smooth-Bore Guns . . By C. G. Abbot 386 
Physics.— Means of Measuring the Speed of Projectiles in Flight . . . 
By C.G.Abbot 388 
