638 SCIENCE PROGRESS 



g. Rutherford, Phil. Mag. 191 1, 21, 669. 



10. Bohr, Phil. Mag. 1913, 26, 1, 476, 857, and later papers. 



11. Einstein, Annalen der Physik, 1907, 22, 180. 



12. W. H. and W. L. Bragg, "X-rays and Crystal Structure." Also W. H. 



Bragg, Trans. Chem. Soc. 191 6, 109. 



13. Nernst and Lindemann, Zeitschr. Elektrochem. 1911, 17, 817. 



14. Langmuir, Journ. Amer. Chem. Soc. 1916, 38, 2221. 



