Supplement to " A'afure,'' February 27, 1919. 



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 a/try Month. Pria :'*. i:,l. 

 Will. On ihe X-Hay Spectra and the Constitution of the 

 \;. in II. By I. Vbgard, Dr. Phil., Professor 

 of Physics al the University ol Christiania. 

 XXIV. N M ition of a simple Pendulum after the 



String has become Slack, By \Y. B. Morton, 

 M, \.. Qiieei 's i nivei sity, Belfast. 

 XXV, Experiments on the High-Tension Magneto. I. By 



Norman Campbell, Sc.D. 

 XXVI. Note on tlie Measuremenl ol the Peak Potential of an 

 Alternating Source. Bj i liffOrd C. Paterson, 

 M.I.E.E.,and Norman Campbell, Sc.D. 

 XXVII. The Lateral Vibration of Loaded Shafts in the 

 Whirling Speed. — The Effect 

 of Want of Balance. By Prof. H. H. Jeffcott. 

 XXVIII. Note on .Kther and Motion. By Sir Oliver 

 Lodge. 

 XXIX. Notices respecting New Books: — Prof. R. C. 

 Tolman's " Ttie Theory of the Relativity of 

 Motion. 

 XXX. George Carey Foster. 



84 pages, luith numerous illustrations in the text. 



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