584 SCIENCE PROGRESS. 



the former without a knowledge and appreciation of the 

 latter is to court failure. Further, it may be remarked that 

 the very complications introduced into the molecular physics 

 of solids by the fact of their possessing crystalline structure 

 only strengthens the methods of investigation ; the highly 

 differentiated nature of crystallographic phenomena in itself 

 alone renders crystallography one of the most powerful 

 instruments of research at the disposal of modern science. 

 The chemist has in the past always been curiously apt 

 in seizing upon and applying to his subject any branch of 

 physics which bears in the slightest degree on chemistry ; 

 many departments of natural science which our predecessors 

 would have classified as pure physics are to-day so well 

 identified with chemistry that to exclude their consideration 

 from chemical text-books would excite surprise. Has not 

 the time come for the chemist to annex crystallography and 

 to set it in its true position as one of the most promising 

 and fascinating branches of physical chemisty ? 



William Jackson Pope. 



