42 Presidential Address 



Still more remarkable the application 

 of X-rays to display the arrangement of 

 molecules in crystals, and ultimately the 

 arrangement of atoms in molecules, as 

 initiated by Professor Laue with Drs. 

 Friedrich and Knipping, and continued 

 by Professor Bragg and his son and by 

 Dr. Tutton, constitute a series of re- 

 searches of high interest and promise. 

 By this means many of the theoretical 

 anticipations of our countryman, Mr. 

 William Barlow, and working with him 

 Professor Pope, as well as of those dis- 

 tinguished crystallographers von Groth 

 and von Fedorow, have been confirmed 

 in a striking way. These brilliant re- 

 searches, which seem likely to constitute 

 a branch of Physics in themselves, and 

 which are being continued by Messrs. 

 Moseley and C. G. Darwin, and by Mr. 

 Keene and others, may be called an apo- 

 theosis of the atomic theory of matter. 



One other controversial topic I shall 

 touch upon in the domain of physics, 

 though I shall touch upon it lightly for 

 it is not a matter for easy reference as 



