PHYSICS IN 1913 625 



Positive Rays, Production of Helium, etc. 



J. J. Thomson, Proc. Roy. Soc. A, 89, 1913, p. 1. 



See also Rays of Positive Electricity, Longmans, 1913. 

 F. W. Aston, Proc. Roy. Soc. A, 89, 1914, P- 439- 

 R. J. Strutt, Proc. Roy. Soc. A, 89, 1914, P- 499- 



Thermionic and Photoelectric Effect 



J. N. Pring, Proc. Roy. Soc. A, 89, 1913, P- 344- 



K. FREYDENHAGEN, Physikalische Zeitschrift, 15, 1914, P- 65. 



H. Kustner, Physikalische Zeitschrift, 15, 19141 P- 68. 



