International Series 

 in Physics 



Consulting Editor — PROFESSOR F. K. RICHTMYER 



♦ATOMIC ENERGY STATES 

 By Bacher and Goudsmit 



*THE PRINCIPLES OF OPTICS 



By Hardy and Perrin 



♦PHOTOELECTRIC PHENOMEMA 



By Hughes and Dubridge 



♦APPLIED X-RAYS 



By G. L. Clark .... 



♦EXPERIMENTAL ATOMIC PHYSICS 



By Harnwell and Livingood . . 30/- net 



THE STRUCTURE OF LINE SPECTRA 



By Pauling and Goudsmit . .21/= net 



QUANTUM MECHANICS 



By Condon and Morse . . .18/- net 



ATOMS, MOLECULES, AND QUANTA 



By Ruark and Urey . . . 42/- net 



MAGNETIC PHENOMENA 



By S. R. Williams .... 18/- net 



♦HIGH FREQUENCY MEASURE- 

 MENTS 

 By A. Hund 30/- net 



* Latest Titles 



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