I 
PRELIMINARY SURVEY 
that has brought it into being : the unsolved problem may 
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afford a greater interest than the most perfect theory. 
REFERENCES 
In Appendix I is given a list of books, for the most part in English, 
having reference to the quantum theory. The standard work on the 
subject is Sommerfeld’s treatise on Atomic Structure and Spectral Lines. 
The beginner may prefer a more popular account such as that given in 
... i - the books by Andrade, Clark, or Oliver Lodge. Reiche’s Quantum Theory 
is a very useful book, and special mention must be made of the invaluable 
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