CONTENTS 
Page 
Mathematics . — The Meaning of Rotation in the Special Theory of Rela- 
tivity By Philip Franklin 265 
Physics. — The Energy Losses Accompanying Ionization and Resonance in 
Mercury Vapor By John A . Eldridge 268 
Physics. — The Crystal Structure of Beryllium and of Beryllium Oxide . 
By L. W. McKeehan 270 
Physics.— vSoME Cases of Nerve Deafness and Their Bearing on Resonance 
Theories of Audition By John P. Minton 274 
Physiology. — The Quantitative Influences of Certain Factors Involved 
in the Production of Cyanosis 
By Christen Lundsgaard and Donald D. Van Sly ke 280 
